In September 2011 I agreed to sell a horse to a stud in France owned by British ex pats. We agreed the contract by email exchange- which was a sum of £1700 to be paid by an initial payment of £800, then 2 x installments of £450 at 3 monthly intervals - and they arranged and paid for the shipping. All has gone ok until last month they emailed me to say that the horse has gone lame and they claimed that their vet says it was my fault as the horse has been overworked in the past. They asked me (by email) to forego the last £450 payment to pay for the horses treatment. I replied (by email) telling them that the horse was absolutley fine when sold it to them (and it really was a good sound young mare) and I advised them that anything could have happened to the horse since they have cared for it - and further advised that I am unable to subsidise them in any way - and suggested they should have claim on their pets insurance if they have any.
I did not get any reply but I note now that the last payment is now a month overdue.
I have been paid each time in UK pounds from the buyer's UK bank account.
Does this contact fall under English law? I can see me having to go to small claims to get my money owing if it does. I really need the money as I have serious health issues and i hate to think i have been 'done'.
Thank you for any replies.

