There was a big to-do a while back about 'health tourists' who had long since left the UK but found that medical treatment in the new 'home' was expensive, so were traveling back to the UK just for whatever under the NHS. That may be where the 'year' came in.
All we were asked was 'are you living here now?' -We said yes, and all was well.
We registered with a doc and dentist in the first couple of weeks after we returned, and less than a week later, I got a letter to come for a mammogram!