I am just about to order an Allspace from my local Essex based dealer. They said the time between order and delivery would be about 3 months.
On a side note, I asked (very nicely) if they could match the deal from Marshalls South Oxford and they made a good enough offer to make me bite off their hand. It is always worth asking. Also, a few other local dealers were just not interested at all in any kind of special offer/cashback/discount. I won’t go into specifics of which dealers were good or bad as I don’t want to put any of them in a difficult position.