Director Declaration

Tristel PLC 03 August 2007 Tristel PLC (the 'Company') Directors Dealings The Company was informed on 3 August 2007 that on that day Paul Swinney, Chief Executive of the Company, sold 50,000 Ordinary Shares of 1p each in the Company ('Shares') at a price of 55p per share. This was in order to provide funds to partially settle a tax liability that Mr Swinney incurred in June 2005 in relation to the Admission of the Company to AIM. Following this transaction, Mr Swinney holds 2,494,969 Ordinary Shares, representing 10.21% of the total voting rights. Contacts: Tristel plc Parkgreen Communications Ltd Paul Swinney Paul McManus Chief Executive Tel: 020 7479 7933 Tel: 01638 721 500 Mob: 07980 541 893 Email: paul.mcmanus@parkgreenmedia.com Teather & Greenwood Limited Nomad & Broker Sindre Ottesen/Simon Brown Tel: 020 7426 9000 This information is provided by RNS The company news service from the London Stock Exchange