@Baldhead:
It's entirely your business of course, and I guess it depends very much of how much you want that particular item from that particular vendor, but speaking personally I don't like the idea of leaving a 50 quid deposit for 4 to 6 days, never mind 4 to 6 weeks!
Whether you're covered by the credit card company or not.
Why should the vendor ask for it and why should you pay a deposit? Surely regardless of if it's an internet transaction or a face to face buy from a shop, it's just the same (simple) deal? You walk in (go on line); pick up the item you want (add it to your shopping cart); go to the check out and pay (fill in the on line form); and that's it, finished?
If the shop (internet vendor) hasn't got it on the shelf then you walk out empty handed, without paying anything, No?
Only if the item is very "special order" in some way should you be asked to pay a deposit so that the vendor orders it for you, or do I see this wrongly?
But as I say, it's obviously your decision, and there MAY be a good reason - but otherwise, it strongly suggests a vendor lacking capital to me. So my suggest is that you watch out.
Hope I'm not teaching granny to suck eggs.
Krgds
AES