its the 5th century, and the romans have abandoned britannia. what happened to the isles after that? did some romans stay??? do we have any sources on the topic? i thought this would be an interesting question.
/u/alriclofgar has previously explained what happened to the Roman ruins in Britain after the fall of the Western Empire.
/u/Tiako has previously answered When did Roman rule effectively end in Britain and was there a single, overriding cause?
/u/Steelcan909 has previously answered It's the fifth century and I'm living in the province of Britannia. Roman troops are beginning to leave and cities are being left to fend for themselves. If I stay in Britain, how drastically will my day-to-day life change in the coming years? which is pretty close to your question.