I am unfortunately not from the UK, but I have been in the same situation not so long ago. we have a thread where people offer their help exactly in such situations:
Do you need help from someone in another country?I would advise you to contact someone who offered their help there to find out if they are available to help you currently.
the person I contacted was Sarah-Bee. she was happy to help and forward me the items I won, and she was very helpful and responsive overall, I can only recommend her in case she is available now ^^
I hope you'll be able to get the pony!