Huss Daw

My relatives oversea are pooling money together to send me a cash gift for my wedding in May. I plan to have this paid in to my personal bank account. I wanted to know if there are any tax implications on this or any thresholds I should be made aware. I also wanted to know if this needs to be declared to HMRC or any paperwork needs to be filled out if is a gift. The uncle sending this lives overseas and is not a UK citizen, nor does he live or work in the UK.