Costain : Proxy Form 2023

Signature

+

Date

+

Explanatory notes

1. Only holders of ordinary shares, or their duly appointed representatives, are entitled to attend, speak and vote at the AGM. A member so entitled may appoint a proxy or proxies, who need not be a member of the Company, to exercise all or any of his/her rights to attend, speak and vote on his/her behalf.
2. You can appoint the chair of the meeting or anyone else to be your proxy at the AGM. To appoint the chair as your proxy in respect of all your shares, fill in any voting instructions and sign and date the Form of Proxy but leave all other proxy appointment details blank. To appoint a proxy other than the chair in respect of all your shares, cross out the words 'the chair of the meeting; or' and insert the name of your proxy (who need not be a member of the Company), then fill in any voting instructions and sign and date the Form of Proxy. To appoint the chair or other person in relation to part of your holding only, please enter in the space provided the number of shares in relation to which they are authorised to act as your proxy. If this space is left blank they will be authorised in respect of your full voting entitlement.
3. You can also, if you wish, appoint more than one proxy provided that each proxy is appointed to exercise the rights attached to different shares held by you. To appoint more than one proxy, you should photocopy the Form of Proxy or contact the Company's registrar, EQ, for further copies at the address set out in Note 18 or on
   +44 (0)371 384 2250 (please use the country code if calling from outside the UK). Lines are open 8.30am to 5.30pm, Monday to Friday excluding public holidays in England and Wales. If you are appointing more than one proxy, please indicate in the box overleaf the proxy holder's name and the number of shares in relation to which you authorise them to act as your proxy. Please also indicate by marking the box on the Form of Proxy if the proxy instruction is one of multiple instructions being given. Multiple proxy appointments should be returned together in the same envelope. No proxy may be authorised to exercise votes which any other proxy has been authorised to exercise.
4. If you appoint multiple proxies you can, if you wish, give each proxy different instructions on how to vote (or whether to abstain from voting) by marking the voting direction section accordingly on each of the relevant forms appointing the proxies.
5. If you submit more than one valid proxy appointment, the appointment received last before the latest time of receipt for proxies will take precedence. If you wish to change your proxy instruction you should submit a new Form of Proxy to EQ at the address set out in Note 18 or to the chair at the AGM.
6. As an alternative to completing this hard copy Form of Proxy, you may appoint a proxy or proxies electronically using the EQ website www.sharevote.co.uk. You are advised to read the terms and conditions governing the electronic voting service which can be found at www.sharevote.co.uk. Alternatively, if you have already registered with EQ's online portfolio service, Shareview, you can submit your form of proxy at www.shareview.co.uk by logging onto your portfolio using your user ID and password. Once logged in simply click 'View' on the 'My Investments' page, click on the link to vote then follow the on- screen instructions. Full instructions are given on both websites. You will require your unique Voting ID, Task ID and Shareholder Reference Number (SRN) printed on the front of this Form of Proxy. For an electronic appointment to be valid the appointment must be received by EQ by no later than 3.00pm on Tuesday 9 May 2023 (or, in the case of an adjourned meeting, not later than 48 hours (excluding non-working days) before the time set for the adjourned meeting). Should you complete your Form of Proxy electronically and then post a hard copy, the Form of Proxy that is last received will be counted to the exclusion of instructions received earlier, whether electronic or posted. If the Company is unable to determine which was last received, none of them shall be treated as valid in respect of that share.
7. CREST members who wish to appoint a proxy or proxies through the CREST electronic proxy appointment service, may do so by using the procedures described in the CREST Manual (available via www.euroclear.com). CREST Personal Members or other CREST sponsored members, and those CREST members who have appointed a service provider(s), should refer to their CREST sponsor or voting service provider(s), who will be able to take the appropriate action on their behalf.

1. In order for a proxy appointment or instruction made using the CREST service to be valid, the appropriate CREST message (a 'CREST Proxy Instruction') must be properly authenticated in accordance with Euroclear UK & Ireland Limited's specifications, and must contain the information required for such instruction, as described in the CREST Manual. The message, regardless of whether it constitutes the appointment of a proxy or is an amendment to the instruction given to a previously appointed proxy, must, in order to be valid, be transmitted so as to be received by the issuer's agent (ID RA19) by 3.00pm on Tuesday 9 May 2023. For this purpose, the time of receipt will be taken to be the time (as determined by the timestamp applied to the message by the CREST Application Host) from which the issuer's agent is able to retrieve the message by enquiry to CREST
   in the manner prescribed by CREST. After this time any change of instructions to proxies appointed through CREST should be communicated to the appointee through other means.
2. The Company may treat as invalid a CREST Proxy Instruction in the circumstances set out in Regulation 35(5)(a) of the Uncertificated Securities Regulations 2001.
3. If you are an institutional investor you may be able to appoint a proxy electronically via the Proxymity platform, a process which has been agreed by the Company and approved by the registrar.
   For further information regarding Proxymity, please go to www.proxymity.io. Your proxy must be lodged by 3.00pm on Tuesday 9 May 2023 in order to be considered valid. Before you can appoint a proxy via this process you will need to have agreed to Proxymity's associated terms and conditions. It is important that you read these carefully as you will be bound by them and they will govern the electronic appointment of your proxy.
4. If the Form of Proxy is signed by someone on your behalf, their authority to sign must be returned with the Form of Proxy. In the case of a joint holding, any holder may sign. If the shareholder is a corporation, the Form of Proxy must be executed under its common seal or signed by an officer, attorney or other person duly authorised by the corporation. The power of attorney or other authority (if any) under which it is signed or a notarially certified or office copy thereof must be lodged with EQ in accordance with the timescale in Note 18.
5. To be entitled to vote at the AGM (and for the purpose of determining the number of votes you may cast) you must be entered on the Company's register of members at 6.30pm on Tuesday 9 May 2023. If the meeting is adjourned, you must be entered on the register by 6.30pm on the date which is two working days before the time of the adjourned meeting.
6. Please indicate with an 'X' in the boxes provided how you wish your vote to be cast. Unless otherwise instructed, the person appointed as proxy will be entitled to exercise his/her discretion as to how he/ she votes or whether he/she abstains from voting on any particular resolution and, unless instructed otherwise, on any other business (including amendments to resolutions and any procedural business) which may properly come before the meeting.
7. The 'Vote Withheld' option on the Form of Proxy is provided to enable you to abstain on any particular resolution. However, a vote withheld is not a vote in law, which means that the vote will not be counted in the calculation of the proportion of votes 'For' and 'Against' a resolution.
8. Any alterations to the Form of Proxy should be initialled.
9. If you complete and return the Form of Proxy, this will not prevent you from attending in person and voting at the AGM should you subsequently decide to do so.
10. In the case of joint holders, where more than one of the joint holders purports to appoint a proxy, only the appointment submitted by the most senior holder will be accepted. Seniority is determined by the order in which the names of the joint holders appear in the Company's register of members in respect of the joint holding (the first-named being the most senior).
11. To be valid the Form of Proxy must reach the Company's registrar, EQ, at Aspect House, Spencer Road, Lancing, West Sussex BN99 6DA, together with the power of attorney or other authority, if any, under which it is signed or a copy of such authority certified notarially, by no later than 3.00pm on Tuesday 9 May 2023.