Edit: This question is for visit visas whilst the applicant is outside the UK.
Let's suppose someone has a long term 2, 5 or 10 year visa. Under what circumstances is he/she obliged to tell the UKVI? Does he need to inform the UKVI if:
- There is a change in financial circumstances? How big of a change must it be?
- If there is a new criminal conviction that would normally not be general grounds for refusal?
- If the applicant has been refused a visa for another country, removed or refused entry?
- Marriage? Birth of a child? Death of a family member?
- Sex change?
The rules say
321A. The following grounds for the cancellation of a person’s leave to enter or remain which is in force on his arrival in, or whilst he is outside, the United Kingdom apply;
(1) there has been such a change in the circumstances of that person’s case since the leave was given, that it should be cancelled; or
The rules don't define what "such a change in the circumstances" is.