Thanks Adam
It is an 18Ah JMT Gel Battery (also reference YTX20CH-BS) and is an exact match to the new battery fitted by Newcomb Brothers of Chelmsford 2-3 years ago, so I know it will fit physically.
As for the 270 cold cranking amps, I am hoping that as long as I look after this one better it will do the job for longer.
It arrives here Thursday and I will let you know if it cures my starting issues.
I am still temped to have a go at the click no start issue click here and will try and trace the correct wire to splice the capacitor and diode into. From Carl Allison’s wiring diagrams it looks like a blue/orange wire connected to the ECU contact 4 on the blue side. I will check the wire colours on a factory wiring diagram if I can source them as sometimes Carl Allison’s wire colours can be different.
Best wishes Chris