Having thrown this now rather hot potato at you, I would like to point out that Maplins run various discount vouchers for purchases over £X all year now. They are not offering RB with £25 off, this is a one-off incentive voucher for joining their newsletter. I would assume that any dealer would be looking at a minimum of 25% mark up (£320 + £80 = £400), but perhaps I'm wrong.........? Maplins (like Screwfix and many others) can afford free postage offers, as they label, address and sort the despatched items ready for DHL/Parcelforce etc., and pay very low charges, as they're on highly competetive contract rates.
It's only supermarkets and competition that bring down prices for the consumer (until they squeeze everyone else out and have a monopoly!).
Having dealt with Maplins (and Cirkit Electrnics - what happened to them?) for many years (too many) I know their product support is generally very good, and no quibbles.
For those with a local store, ring them up and I'm sure they'll get one for you (if they're showing no stock)!
Mark, I would rather buy one from you - match their price.............? and you have a sale!