cheers for the advice fellas,iv had the battery out numerous times an to be honest its mint,but still you never know wat lurks underneath,iv not checked the fusebox yet,as for the boot i did have a leak from the back lights cos i put the smoked ones on but cured it with silicone,iv also checked sunroof drainage which appears to be ok, how do i know if its the heater matrix? another thing is this only started on its return from the bodyshop????