Glowworm 38 Space Saver - Bal/Flue Gas Boiler?

Hi ,

I have a Glowworm 38 Space Saver Gas boiler and its not behaving.

Initially I would like to open the boiler. DO I need to open any screws ? Does the lid just come off ?

Please could someone email me any manual or instruction manual , so that I a can diagnose it. I have replaced the spark generator. Now it is sparking but I think the thermocouple needs replacing ?

Thanks. I would be delighted if you could help
A.One.Properties@gmail.com