So, after the Ashdown I bought packed up and went back for a refund, I found another listing for an Ampeg PF350 head and made an offer on that, which was accepted. Took a while to arrive (as per my thread in Off Topic), but it is a fantastic little amp and sounds great.
However... The very next week, an Ampeg SVT450 head was listed, collection only from half-a-mile away from my house. Now, as much as I understand that it's not the original valve job, and doesn't offer a huge amount more than the PF except for graphic EQ and a few more watts... I just couldn't resist throwing bid in. Ended up winning that one too!
So now I have the little PF as a great home practice or rehearsal amp (headphones, aux in and no speaker connection needed are all great features for home use), and the SVT for showing off at gigs!