TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

For filings with the FCA include the annex

For filings with issuer exclude the annex

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES i

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: ii

Avanti Communications Group plc

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

Increase in issued share capital by issuer

X

3. Full name of person(s) subject to the notification obligation: iii

Caledonia Investments plc

4. Full name of shareholder(s)

(if different from 3.): iv

5. Date of the transaction and date on which the threshold is crossed or reached: v

9 February 2017

6. Date on which issuer notified:

9 February 2017

7. Threshold(s) that is/are crossed or reached: vi, vii

4%

8. Notified details:

A: Voting rights attached to shares viii,ix

Class/type of shares

if possible using the ISIN CODE

Situation previous to the triggering transaction

Resulting situation after the triggering transaction

Number of Shares

Number of Voting Rights

Number of shares

Number of voting rights

% of voting rights x

Direct

Direct xi

Indirect

xii

Direct

Indirect

GB00B1VCNQ84

Ord 1p shares

6,187,222

6,187,222

6,187,222

6,187,222

3.82%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration datexiii

Exercise/ Conversion Period xiv

Number of voting rights that may be acquired if the instrument is exercised/ converted.

% of voting rights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv,xvi

Resulting situation after the triggering transaction

Type of financial instrument

Exercise price

Expiration datexvii

Exercise/ Conversion period xviii

Number of voting rights instrument refers to

% of voting rightsxix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

6,187,222

3.82%

Proxy Voting:

10. Name of the proxy holder:

11. Number of voting rights proxy holder will cease to hold:

12. Date on which proxy holder will cease to hold voting rights:

13. Additional information:

None

14. Contact name:

Krista Burwood

15. Contact telephone number:

0207 802 8080