Thanks dude
I'll do the g'box procedure, have done before but no harm in it. As I said though, its actually better for me now and causing no issue.

Thanks for input on the wires, will try and work them out - don't have towbar or front heated screen - but least there doesn't seem to be an issue disconnecting them to replace the ends. Hope they have alittle slack on them

"Delta" head unit? is that the technical name for a Concert? I do have a radio code I think - as the part in the owener manual is missing - presumably put somewhere safe by a former owner as it says to do!!

Idle - oh.. damn. Hoped that would be 'yeah it will even out' - no idea why its decided to do that then. Nothing else at all changed..

I have known the battery isn't in great shape a while to be fair.. its never been a super fast cranker but lke you say think the cold has killed it. Its defo over 4-5 years old anyway.