The Sealey seems a decent enough machine but personally I would choose the Clarke although I doubt there would be much to argue about over which is best.
Cheapest is Machine Mart with a VAT free voucher, the members on here often give theirs away when they arrive.
Not sure I would buy from ebay, there probably is a couple of decent sellers but a lot are box shifters who don't want to know a few months down the line if a problem arises.
Ok, thats a very good point. Then, I must ask the begging question....Does anyone have a Vat voucher they are willing to give a very nice but not so rich Morris minor owner?.