Instructions needed for the thorn m, to safety check the appliance.
Paul Hunt
April 2020
Alternatively go the legal route and get a Gas Safe certified engineer tomlook at it
Sjjsgg
November 2019
It may be possible to help with more detailed information of the problem. However, first thing to check is the pilot light gas jet is not blocked or restricted. Remove the gas jet and gently clean with hot soapy water and a soft brush. Poking something into the jet hole to clear it, should be avoided at all costs.