TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

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

Filtronic 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):

On market transfer between indirect and direct funds

√

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

Aviva plc & its subsidiaries    

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

Registered Holder:

BNY Norwich Union Nominees Limited      636,148*

Chase (GA Group) Nominees Limited       3,485,858*

Chase Nominees Limited                               329,103*
*denotes direct interest

Vidacos Nominees Limited                         1,091,119

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

14 April 2010

6. Date on which issuer notified:

16 April 2010

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

6% to 5% Change at Direct Interest Level

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

Ordinary Shares

GB0003362992

Direct
4,482,504

Indirect
1,059,724

Direct
4,482,504

Indirect
1,059,724

5,542,228

4,451,109

1,091,119

5. 99%

1.47%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial
instrument

Expiration
date xiii

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 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

5,542,228

7.46%

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

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)

Proxy Voting:

10. Name of the proxy holder:

See Section 4

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:

Figures are based on a total number of voting rights of  74,323,093.

14. Contact name:

     Neil Whittaker

15. Contact telephone number:

     01603 684420