Holding(s) in Company

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

Tritax Big Box REIT 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):

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

Aviva plc & its subsidiaries

4. Full name of shareholder(s)  (if different from 3.):iv

Registered Holder:

Available on Request

1,908,659*

BNY Norwich Union Nominees Limited 2,835,239*

Chase (GA Group) Nominees Limited

 54,741,356*

Chase Nominees Limited

 574,277*

CUIM Nominee Limited

616,879*

State Street Nominees Limited

14,574,432*

*denotes direct interest

BNP Paribas - London

513,253

Chase Nominees Limited

4,003,486

Vidacos Nominees Limited

3,730,449

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

18 October 2016

6. Date on which issuer notified:

19 October 2016

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

7% to 6% Change at Direct Interest Level (Box 8A)

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

Ordinary SharesGB00BG49KP99

68,817,605*

68,817,605*

83,498,030

75,250,842

8,247,188

6.81%

0.75%

* Includes Right to Recall Loaned Shares (3,917,253)

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

RIGHT TO RECALL LOANED SHARES

N/A

N/A

3,765,062*

* Direct Interest

0.34%

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

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date xvii

Exercise/Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

87,263,092

7.90%

9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable: xxi

The voting rights are managed and controlled by Aviva Investors Global Services Limited and Friends Provident International Limited, with the following chain of controlled undertakings:-

Aviva Investors Global Services Limited:

· Aviva plc (Parent Company)

· Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc)

· Aviva Investors Holdings Limited (wholly owned subsidiary of Aviva Group Holdings Limited)

· Aviva Investors Global Services Limited (wholly owned subsidiary of Aviva Investors Holdings Limited)

Friends Provident International Limited:

· Aviva plc (Parent Company)

· Aviva Group Holdings Limited (wholly owned subsidiary of Aviva plc)

· Aviva Life Holdings UK Limited (wholly owned subsidiary of Aviva Group Holdings Limited)

· Friends Life FPG Limited (wholly owned subsidiary of Aviva Life Holdings UK Limited)

· Friends Life FPL Limited (wholly owned subsidiary of Friends Life FPG Limited)

· Friends Life Limited (wholly owned subsidiary of Friends Life FPL Limited)

· Friends Life and Pensions Limited (wholly owned subsidiary of Friends Life Limited)

· Friends Provident International Limited (wholly owned subsidiary of Friends Life and Pensions Limited)

Proxy Voting:

10. Name of the proxy holder:

See Section 4

11. Number of voting rights proxy holder will ceaseto hold:

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

13. Additional information:

Figures are based on a total number of voting rights of 1,105,159,529 as per the Company's announcement of 14 October 2016.

14. Contact name:

Neil Whittaker, Aviva plc

15. Contact telephone number:

01603 684420