Cool, several suggestions already.
Dave, I'll go through them and check for UK availability based on not having to pay too much for currency transfer etc.
Everyone... if I can't find something for UK buyers but you think I've missed something please let me know the site you have found it on and I will check out the charges involved.
We have previously said that it needs to be from a site which is known by regular users of OB to sell good plants. I don't know if that still applies this time, but personally I would only want to buy from somewhere that someone I know here can tell me they've been happy with in the past.
For those that don't know the problem in the UK is that many European sites charge an IBAN fee for taking payments in £ rather than € and once you add the cost of the postage you are up to almost €40 before you even add the cost of the plant. Places that take paypal are the best as that has no currency charges involved. I'm not sure about credit card, but in the past I've seen some sites which only take € credit cards and most folks in the UK do not have those.
Finally I will say, that as I'm currently the only UK participant, if it proves too difficult to find a selection of plants I can buy then I will bow out of this one... my hubby would be pleased if I didn't buy yet more orchids