Many, Many thanks for all the offers of help, very much appreciated.
Latest situation .. existing (knackered) rad has part no JL52485466 on it .. which doesn't seem to exist anywhere on anyones system

, and all factor systems come up with the same one that europarts did ..and we know its wrong ..

Spoke to a guy at AndyC's place (Andy was busy) .. his system says that my car requires part no JL52482600. - although no-one knows what the differences are

Coolingcar (who have been really helpful trying to get the correct one) reckon they can get an equivalent one of them to me, possibly by late morning, certainly by tomorrow afternoon.... which is a tad late for my purposes..... and would cost about £120 total
Vauxhall Swindon can get me the exact part (52482600) by 09:00 ... and will cost £297 total after trade discount..

So, best part of £200 difference.
I
HAVE to have a driveable car -decision wise - by 1500 tomorrow, or its a hire car job.
Hirecar has to be Wednesday to Monday as we are leaving very early Thursday, they won't take it back in on a Sunday, has to be a decent size for 4 adults plus kit. Additional fuel for not running on LPG added .. and at a very poor guess the hire car option is around £300 in total by the time you add in all the insurances as well ...

So I've made the decision to go for the Vauxhall one... gives me around 5 hours to get it in and sorted which should be ample - even for me - and will - overall, and if it works as I hope - actually end up cheaper than the hire car + coolingcar option
Once again .. thanks to all, much appreciated
