Holding(s) in Company

RNS Number : 1584S

Derwent London PLC

03 September 2010

TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

DERWENT LONDON PLC

2. Reason for the notification (please place an X inside the appropriate bracket/s):

An acquisition or disposal of voting rights: (X)

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:

BlackRock, Inc.

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

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

31^st August 2010

6. Date on which issuer notified:

2 September 2010

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

5.00%

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
	Number of shares	Number of voting Rights
Ordinary	5,081,746	5,081,746

Resulting situation after the triggering transaction

Class/type of shares if possible using the ISIN CODE	Number of shares	Number of voting rights		% of voting rights
		Direct	Indirect	Direct	Indirect
Ordinary			3,863,362		3.82%

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
CFD			185,055	0.18%