My Discovery 1 this time.

[Picky2k]

It's struggling to crank over but only when it's really cold.

[Matthews]

Have you tested the basics , ie is the battery goosed !!!

[Picky2k]

Yep the battery has tested ok.

[bandiflip]

Well if battery is ok....ya have cleaned all connections and checked earths.....try powering starter motor direct with jump leads or bridge it out with a screw driver,make sure it works

[Bobcat]

Daft question but is the battery the correct size? amps wise.
Dont discos have a timer relay on the heater plugs? Could it be that?
Mark.

[Santa]

Had the same problem with my old 110, ok all year but turnend over slowly in winter turned out battery was for a v8 i.e to small not enought cranking amps replaced with a battey with more cranking power worked every time, should be at least over 800 cranking amps
Note - do not look at a halfords battery chart as they give the spec for a petrol model only.

[Picky2k]

I'm going to pick up a new battery and see if that cures the problem.

All the connections have been cleaned and even added additional earth points.

Cheers chaps....James

[Picky2k]

Nice cold morning, and am pleased to say that she started just fine!!!

Thanks for all your help. Hopefully see you on the 27th!

[bandiflip]

Well now its sorted,If ya just send us all your address then we can send our bills for a hopefully,prompt payment !