Holding(s) in Company

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

Hyder Consulting Plc

2. Reason for the notification

(please tick the appropriate box or boxes)

An acquisition or disposal of voting rights

Yes

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

An event changing the breakdown of voting rights

Other

(please specify):

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

Legal & General Group Plc (L&G)

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

Legal & General Assurance (Pensions Management) Limited (PMC)

5. Date of the transaction (and date on which the threshold is crossed or reached if different):

20 April 2010

6. Date on which issuer notified:

21 April 2010

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

L&G (From 4% to 3%)

8. Notified details:

A: Voting rights attached to shares

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

Direct

Direct

Indirect

Direct

Indirect

Ordinary 10p

1,532,799

(As on 14/03/2008)

 1,494,685

 1,494,685

3.89%

B: Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ Conversion Period/ Date

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

% of voting rights

Total (A+B)

Number of voting rights

% of voting rights

1,494,685

3.89%

Proxy Voting:

10. Name of the proxy holder:

N/A

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

N/A

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

N/A

13. Additional information:

Notification using the total voting rights figure of  38,370,320

14. Contact name:

Joanne Shelton (LGIM)

15. Contact telephone number:

020 3124 3850