I have a couple official documents (envelopes) that I need sent to a UK "residential address" (I m a UK citizen, BTW). I am in the US. (It's all legit.) I am looking for an address to which to post. I would provide you by email a prepaid FedEx label to forward to my US address.
Maybe there is someone in the UK who needs a US address for something.
PM if you might be interested in exchanging favours.