Can´t care less of the general consensus on this site. It consists on a bunch of over-worried and nervous people.
The standard procedure is that closed Sunday, can do Monday, even if one day late and there is no fine. END!
OP, you can disregard this comment. You will not be charged for overstay. It is perfectly ok to do your extension on a Monday if your extension expires on a Sunday. However, good planning tells you do do it a week before next time.
He simply pick on the farmers instead of the Brits. You know, we all need something to get hooked on. Now you jump on him every time he make a comment too. Your starting to get busy, huh!
For being an academic, the person is very unaware of how things work. They do not work like that. Set up, try, and see what happens is the general model.
Yep, time to drive to the mate at the garage. You know man, I´ve never made this much before. You really manage to speed it up last time. Think you can crank it a little bit more?