Update - I asked the question because the screen now leaks badly along the whole of the top edge after the car has been sitting at the side of the house for 7 years on SORN. When looking for something else in the paperwork file I found the invoice for the replacement done by Autoglass back in 2005 which gives a lifetime warranty provided the car stays with the owner for whom the work was done.
A quick phone call to Autoglass elicited the fact that yes, they will honour the warranty but the glass is now on "back order" from the factory and they will let me know when it comes in. They won't just take the glass out to re-seal it, they will only put a new screen in so, looks like a win-win but I need to seal it before we trot off to Spain next month. Sikaflex EBT looks like the stuff to use (self-curing high viscosity PU sealant) which is available from Screwfix for £7.39. Prep work done yesterday and now waiting for the rain to stop.
