hi Bill, thanks (as usual) for the info, yes, i had looked at fowlers and found nothing immediately available.
and Rene, thanks for that info too, i will try sikaflex, it is used in in the automotive industry for bonding autobody parts , and more importantly, my Son does campervan conversions and always has a few tubes around.... it's very expensive stuff.
i have located a pair on fleabay, cheapish, probably cheap chinese stuff, but from a uk supplier, so will give them a try as well
cheers