Holding(s) in Company

Diagonal PLC 16 June 2003 DEALINGS BY SUBSTANTIAL SHAREHOLDERS 1) NAME OF COMPANY DIAGONAL PLC 2) NAME OF SHAREHOLDER HAVING A MAJOR INTEREST HENDERSON GLOBAL INVESTORS LTD 3) Please state whether notification indicates that it is in respect of holding of the Shareholder named in 2 above or in respect of a non-beneficial interest or in the case of an individual holder if it is a holding of that person's spouse or children under the age of 18 SEE 2 ABOVE 4) Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them. HENDERSON GLOBAL INVESTORS LTD 5) Number of shares/amount of stock acquired. - 6) ( - %) of issued Class 7) Number of shares/amount of stock disposed 886,070 8) ( 0.99 %) of issued Class 9) Class of security ORDINARY SHARES OF 10P EACH 10) Date of transaction 13 JUNE 2003 11) Date company informed 16 JUNE 2003 12) Total holding following this notification 8,350,875 13) Total percentage holding of issued class following this notification 9.34% 14) Any additional information N/A 15) Name of contact and telephone number for queries IAN FARRELLY 01252 733 711 16) Name and signature of authorised company official responsible for making this notification Date of Notification 16TH JUNE 2003 This information is provided by RNS The company news service from the London Stock Exchange FMMSDSEEM

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