Thanks everyone for your help...its not over yet! Thanks to the great directions above I got to the underside of the aerial and its dry as a bone, poured water onto and around the aerial and nothing came through, added to that for the first time we have noticed the front of the sunroof inside is sopping wet!!
So its defo the sunroof!! First off can someone tell me what needs doing to the sunroof? resealing or new seal?
second and more urgently, i think water has got into the immobiliser receiver cos thats just gone a bit tits up. Wont work from outside the car and if you spend five minutes pressing it at various angles sometimes we are lucky and it will plip. tried both keys but no luck. When holding the button down on the key the red light flashed quite quickly. Never noticed the flashing before, is that right??
So....im guessing we need a replacement immobiliser receiver unit, is this a big deal? lots of money and have the keys got to be re-programmed? or is that something different,
Urgent help greatly appreciated.
Thanks everyone.