Window splits

["JG Philipps" <jg@wordorder.com>]

Suffered the consequence of failing to deal with a leaking roof during the
summer. Ice on both interior and exterior of the roof made the rear window
brittle enough to split while patrolling a particularly rough country road.
(Who would ever believe that the UK could ever be cold and not just wet!)

Are there any recommended fixes? So far a combination of careful use of a hair
dryer and some adhesive backed clear plastic seems to have worked well
enough.

Any ideas?