ATK.L Regulatory News (ATK)

TR-1: Notifications of Major Interests in Shares

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

WS Atkins plc

2: Reason for notification (yes/no)

An acquisition or disposal of voting rights

yes

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

no

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

no

An event changing the breakdown of voting rights

no

Other (please specify):

no

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

obligation:

Standard Life Investments (Holdings) Limited (Parent Company) -14.06% comprised of:

Standard Life Investments Limited - 12.907%

Ignis Investment Services Limited - 1.154%

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

 Vidacos Nominees\HSBC

5. Date of the transaction (and date on which the threshold

is crossed or reached):

12/06/2015

6. Date on which issuer notified:

15/06/2015

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

14%

8: Notified Details

A: Voting rights attached to shares

Class/type of share If possible use ISIN code

GB0000608009

Situation previous to the triggering transaction

Number of shares

Number of voting rights

13,861,472

13,861,472

Resulting situation after the triggering transaction

Number of shares

Number of voting rights

Percentage ofvoting rights

Direct

Indirect

Direct

Indirect

14,075,989

7,505,545

6,570,444

7.497

6.563

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial instrument

Expiration date

Exercise/ conversion period/date

No. of voting rights that may be acquired(if the instrument exercised/converted)

Percentage of voting rights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate

Exercise/Conversionperiod

Number of votingrights instrumentrefers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

14,075,989

14.06

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

Standard Life Investments (Holdings) Limited (Parent Company) - 14.06% comprised of:

Standard Life Investments Limited - 12.907%

Ignis Investment Services Limited - 1.154%

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:

14. Contact name:

GIOS@standardlife.comStandard Life Investments Ltd

15. Contact telephone number:

(0131) 245 6565