The link above is sound and detailed advice. Very interested in the heat treatment, I will try that for housing. The only different l thing I do it the olive oil treatment for all new snakes.

For all new snakes I wipe them down first with a paper towel and some olive oil. This has two advantages for me.
1 it suffocates mites as they breath trough their skin and has a bit more of an ongoing affect than a soak.
2, It also helps them come off into the paper towel, so i can more easily see if there are any adult stage mites present.

If there are adult stage mites present I would probably use frontline, but there has not been yet.

Mites or not I then treat the tubs similarly to the link above, but the products in the UK have different names sometimes. I use ardap spray. This product is supposed to work for 6 weeks.
I treat the tubs, then put paper in and treat that. (all with a lid on) then air it for 15 mins. As the link above, I don't let it near the snakes for 24 hours and a further airing. after which time I will add a water bowl.

That's my process. if I ever got an infestation later after all quarantine was over and the adap spray had worn off, I would use predator mites.

This is just what I do and not advice. do your own research. Except for the olive oil thing which has almost no risk.