I bought a domain 3-4 weeks ago from a company; I paid and it was transfered all smoothly. They have only just got back to me to say I haven't paid the VAT and could I transfer it ASAP. During the negotiations VAT was never mentioned once - I spoke to 2-3 people during the negotiations/payment/transfer and it was never said the amount agreed was + VAT. When they emailed me the invoice they put the bank details on their email so I never even looked at it. I have now checked the invoice and it is for the agreed amount + VAT. Do they have a leg to stand on to try and claim the VAT from me?