Well I've now received my resolution offer from VW/my dealer. I'm being given a rebuild with priority build slot (October). On top of that they're taking my px as planned in September and I'm getting a hire car (fully insured) while I wait for the new one. I find out what car I'm getting next week, but I'm told it wont be smaller than a Golf. They're also throwing in the service plan FOC.
Overall pretty satisfied with the outcome and how my dealer and VW have dealt with this. Bring on the anxious wait for confirmed build dates etc once again! 
Are you using VW solutions? If so the service plan is a £199 freebie for having to wait a few more months. I suppose you could say you're saving 2 months depreciation on your p/x too (which will be somewhere in the region of £500 if you have something that was circa £23-25k a few years ago). Seems that they are not immune to compo, but I thought you'd get a bit more than that out of them, in all honesty.
From the time they're making you wait it would seem as though you are slotted in just beyond the point of the very latest confirmed builds (those on BW 38 or 39?). It would seem then that BW38/39ers wont be delayed by the replacement cars getting allocated into production, but those on BW40+ (estimated) are probably going to be set back a week (assuming most hail damaged cars are replaced - it was about 1 week's worth of production) in addition to the 2 week delay they already seem to be runing to (or is that just us TRers?).