Enough! Enough!
I already know I want an A3 printer. I guess this thread's just an expression of some shameless self-denial.
Everybody's advice is very welcome, but Bob has the gist of where I'm at. Tom, I'm guessing you either a) earn a lot of money, or b) don't have a significant other. Delete as applicable. I'm all out of (a) and a fully paid up member of (b).
My wife might just leave me the first time I pop into PC World and come out £100 poorer and only a very small bag of "paint" to show for it. If not the first time then certainly the next month.
Now, having said all that, Gordon has opened up a whole new can of worms. I happen to know a pub (my local) who has recently renovated the bar. There's been bare walls for the last 6 months and I know the owner thinks it's "cool" but I also know most of the clientele don't.
If I had my own A3 printer I could do things to order. I'd have way more control, as Tom rightly points out. And Gordon's right too. I wouldn't dream of buying a print online. I have bought prints & originals from galleries in the real world though. So Gordon's view is valid. If I had a couple of A3 pictures up in prominent public places, even if I pay for it, that's got to be good for business. I could have a small card in the corner of each frame with more cards available at the counter, behind the bar or wherever.
Hmmm...food for thought.
Zorro
And another thing. Thanks guys

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