I have a 2000 bailley pagaent imperial which I have just cleaned and pollished ready for our trip next week to yorkshire.while up through the rooflight cleaning the roof I noticed what looks like a hairline crack about 6" long (shock Horror) . is this something I should be worried about is it possible or is it just a flaw in the paintwork. There are no sighns of any water ingress that I can see. if it is a crack can it be repaired easily