Blocklisting Interim Review

Name of applicant:

HENDERSON GROUP PLC

Name of scheme:

BLOCK LISTINGS UNDER THE HENDERSON BUY-AS-YOU-EARN PLAN AND THE HENDERSON GROUP PLC SHARESAVE SCHEME.

Period of return:

From:

20 NOVEMBER 2008

To:

31 JANUARY 2009

Balance of unallotted securities under scheme(s) from previous return:

2,000,000 (new Blocklisting, effective 20 November 2008, following Scheme of Arrangement and new Listing of Henderson Group plc on 3 November 2008)

Plus: The amount by which the block scheme(s) has been increased since the date of the last return (if any increase has been applied for):

NIL

Less: Number of securities issued/allotted under scheme(s) during period (see LR3.5.7G):

122,425

Equals: Balance under scheme(s) not yet issued/allotted at end of period:

1,877,575

Name of contact:

MRS WENDY KING

Telephone number of contact:

020 7818 4233