I'm an American student who will be interning in the UK on a Tier 5 Temporary Worker - Government Authorised Exchange visa for 8 weeks this summer. I was wondering if it would be possible to stay longer to attend my cousin's wedding in Luxembourg exactly one week past the end date listed on my certificate of sponsorship.
I would like to return to the UK after the wedding with the intention of leaving within a day or two. That way I wouldn't have to bring all my luggage for the summer to the wedding. But would I be allowed to re-enter the UK past the end date on my CoS? Or would it be ill-advised to stay in the UK past the end date at all?