thermocouple

Hello, first time post on here hoping someone can help me. I'm looking to try and find a replacement thermocouple for the above fire. I believe this is a baxi part number 243737. E25-202 I've looked everywhere but all unavailable and the universal ones don't fit. Thanks Nicola

I had a problem with water leaking out of the Automatic Air Vent. Skip forward 2 nightmare days or leaks at the air vent , at then at the drain cock, and the system is now refilled and not leaking, however the pilot won't stay alight. When I drained down the system I only vented the first...