Right measurements - 12.5cm wide (but there's room for 15cm), 6cm high (but there'd be room for 10cm) and 10cm deep (and there'd be room for 12cm or maybe 13 at a pinch); system requires 230 volts.

Ideally I'd prefer to have a rather higher rating than 145 watts, - I gather that extra watts just means that you've got them in reserve if you ever need them. I noticed in the Watford site they give a range of wattage rating. I don't know what the useful upper limit would be, the price difference doesn't seem very great.

One reason I'm cautious about mail order, especially from overseas, is the need to get the connections right. The connection to the motherboard is a 20 pin ATX one, which seems standard; the connection to the hard disc is a "Mol ex" plug - and then from that there are two other sets of wires going off a) to a Mol ex plug that goes to the CD-drive, and b) a small Berg plug that goes to the floppy. And there are spare connections going to two other Mol ex plugs which aren't used for anything.

As GUEST 09:54 AM said, I'm reluctant to try moving to a new case, because there seems a lot of chances to screw things up, what with all the different items involved. Especially the motherboard. The only thing I've done inside the case previously has been putting in extra memory, and I think putting in a new Power Supply seems about as much as I'd feel reasonably confident of doing as the next step. And it looks as if it should be possible to get something that would enable me to do that.

But I'm feeling increasingly indignant at the firm who sold the computer having the gall to want to charge £159 for supplying and plugging in a unit that costs around £20, and probably a lot less to them. (And at the same time, to produce the unit for that kind of money must mean that somewhere, out in China or wherever, there are people putting them together who must be working for a pittance.)