Upvote:6
The UK and USA do share information Do the governments of United Kingdom and USA share immigration data? You will have to declare the overstay in your UK visa application or you risk an automatic refusal under Paragraph 320(7A) of the Immigration Rules https://www.gov.uk/guidance/immigration-rules/immigration-rules-part-9-grounds-for-refusal if they find out about it, and a 10 year ban for deception.