Update: Found a solution.
Alternate offered to create an order for 14 stats to be paid via bank transfer but as I expected this was to a German bank so with the bank charges for international payments (even though payment was in GBP) this worked out the same as 2 lots of postage. I asked about paypal and they said they could do this but it would be in Euros. I tried this and there were no paypal fees other than paypal's conversion rate. I have a 0% fee credit card so I told paypal to pay it in Euros and used that. That's now ticked all the boxes, no extra postage, no bank fee, no conversion fee, so I'm a happy bunny :-).