Thanks to you all for your info!
I think I have found the cause to the problem; I have been working on the car in daylight so havent noticed it before.
We i went to drive it tonight, I shut the door and all the interior lights went off apart from 2 in the back!
My daughter had them on on the last drive. We were all tired and it was late at night plus I have limo window tints all round the rear which makes it hard to see the interior lights when on.
This must have been what caused it! (I hope!)
I didnt intend to come across as being rude Ratty, just wanted to be sure that I didnt want to ruin my new battery! Sorry mate!!:doh:
I think Ill get a solar charger to be safe...
Thanks all again!