+-----------------------------------------------------------+
| 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 | SThree PLC |
| attached: | |
+-------------------------------------------------------------------+
+-------------------------------------------------------------------+
| 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 | no |
| already issued to which voting rights are attached | |
|-------------------------------------------------------------+-----|
| An acquisition or disposal of instruments with similar | no |
| economic effect to qualifying financial instruments | |
|-------------------------------------------------------------+-----|
| An event changing the breakdown of voting rights | no |
|-------------------------------------------------------------+-----|
| Other (please specify): | | no |
+-------------------------------------------------------------------+
+-------------------------------------------------------------------+
| 3. Full name of person(s) subject to the | Standard Life |
| notification | Investments Ltd |
| obligation: | |
|-----------------------------------------------+-------------------|
| 4. Full name of shareholder(s) (if different | Vidacos Nominees |
| from 3.): | |
|-----------------------------------------------+-------------------|
| 5. Date of the transaction (and date on which | |
| the threshold | 09 December 2009 |
| is crossed or reached): | |
|-----------------------------------------------+-------------------|
| 6. Date on which issuer notified: | 10 December 2009 |
|-----------------------------------------------+-------------------|
| 7. Threshold(s) that is/are crossed or | 9% |
| reached: | |
+-------------------------------------------------------------------+
+-------------------------------------------------------------------+
| 8: Notified Details |
|-------------------------------------------------------------------|
| A: Voting rights attached to shares |
|-------------------------------------------------------------------|
| Class/type of share If possible | GB00B0KM9T71 |
| use ISIN code | |
|-------------------------------------------------------------------|
| |
|-------------------------------------------------------------------|
| Situation previous to the triggering transaction |
|-------------------------------------------------------------------|
| Number of shares | Number of voting rights |
|-----------------------------------+-------------------------------|
| 10,858,429 | 10,858,429 |
|-------------------------------------------------------------------|
| |
|-------------------------------------------------------------------|
| Resulting situation after the triggering transaction |
|-------------------------------------------------------------------|
| Number of shares | Number of voting rights | Percentage of |
| | | voting rights |
| |-------------------------+-------------------|
| | Direct | Indirect | Direct | Indirect |
|---------------------+-------------+-----------+--------+----------|
| 10,961,917 | 3,105,415 | 7,856,502 | 2.551% | 6.453% |
+-------------------------------------------------------------------+
+---------------------------------------------------------------------------+
|B: Qualifying Financial Instruments |
|---------------------------------------------------------------------------|
|Resulting situation after the triggering transaction |
|---------------------------------------------------------------------------|
|Type of |Expiration|Exercise/ |No. of voting rights that may |Percentage|
|financial |date |conversion |be acquired |of voting |
|instrument| |period/date|(if the instrument |rights |
| | | |exercised/converted) | |
|----------+----------+-----------+------------------------------+----------|
| | | | | |
+---------------------------------------------------------------------------+
+--------------------------------------------------------------------------------+
|C: Financial Instruments with similar economic effect to Qualifying Financial |
|Instruments |
|--------------------------------------------------------------------------------|
|Resulting situation after the triggering transaction |
| |
|--------------------------------------------------------------------------------|
|Type of |Exercise |Expiration |Exercise/ |Number of |% of voting |
|financial |price |date |Conversion |voting |rights |
|instrument | | |period |rights | |
| | | | |instrument | |
| | | | |refers to | |
|--------------+----------+------------+------------+------------+---------------|
| | | | | |Nominal |Delta |
| | | | | |--------+------|
| | | | | | | |
+--------------------------------------------------------------------------------+
+-------------------------------------------------------+
| Total (A+B+C) |
|-------------------------------------------------------|
| Number of voting rights | Percentage of voting rights |
|-------------------------+-----------------------------|
| 10,961,917 | 9.003% |
+-------------------------------------------------------+
+-------------------------------------------------------------------+
| 9. Chain of controlled undertakings through which the voting |
| rights and/or the |
| financial instruments are effectively held, if applicable: |
|-------------------------------------------------------------------|
| |
+-------------------------------------------------------------------+
+------------------------------------------------------------------+
| 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: | investments_mo@standardlife.com |
| | Standard Life Investments Ltd |
|-------------------------------+---------------------------------|
| 15. Contact telephone number: | (0131) 245 6565 |
| | |
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solely responsible for the content of this announcement.