Does anyone know what part number I need for a starter motor for the K3? (metro GTi) local factors say there are lots of variants. I understand there is a slightly more powerful version 0.8Kw too.
Not sure if it really is my problem though, it turns over slowly when cold but enough to start ok but when it all gets hot it hardly wants to turn over at all and won't start, it bump starts easily though.

When hot it sounds like you are getting heat-soak, it's a common problem with mid engined cars.

Maybe a bit of cold air ducting would help?

That's the exact oposite of My K3.

Struggles (and some) when cold - 1st touch of the key when warm / hot

Problem could be the size of battery cables as the cable run is very long. I have doubled both live and earth cable up as my car used to struggle sometimes to start now alot better.Also check that you have got a good earth path.
Matty

Im torn between thicker cables or a second (smaller) battery in the back of the car (and hope it doesn't cook)

Sorted now I think! it was the link strap connection between the solenoid and the starter! Had been wondering how to pull through bigger cables from the battery.
Saw a couple of nice GTMs this morning at Woburn Sands, looks like they will have a good day, some wonderful cars there.

I hope you weren't getting battery advice from Stuart.

plan ahead, bring a spare (as I did) aways thinking Tim, always thinking... I think that all who attended enjoyed themselves..?.. I dont have the total of cash raised by the GTM's but its about £600ish so thanks to the four of us we did quite well (whats the best way to throw a 3kg weight Tim? under or over arm??)

Into the nettles, I think you'll find.