Hello Nigel,
Being a member of the European Coaster Club, last I heard from them was that the Pleasure Beach expect it to reopen by the late August Bank Holiday, if not just before. Presumably there will be some kind of relaunch "party" as what with the recent fire and sad Board member news of late I expect they could do with some light-hearted promotional activity.
I've heard quite a few members saying that the ride will never run the same again, what with having to have new trains etc, but I think it will be interesting to compare the new ride experience with the old. Hopefully the ride will be restored to its former glory. However, I always mourn the loss of the park's former classic Virginia Reel coaster they had where the new theatre building now stands near the Noah's Ark side. I only ever got to ride that spinning wooden coaster once, ironically in its final season in 1982. If only I'd known its destiny I'd have taken quite a few more circuits.
Hope you're lucky with the National's reopening on your visit. (You could try checking the park's website for latest news)
Martin Porter