Smallman1 Pretty sure you are not supposed to leave Tier 3 without good reason, although I would need to check that!
“If you live in a Tier 3 area, you must continue to follow Tier 3 rules when you travel to a Tier 1 or Tier 2 area. ”"
Just lifted off the gov website, it also says stay in your area unless you have a good reason to leave it.