I had my Mk7 SWB camper fail it's MOT on a damaged tyre a few weeks ago, with a "just legal" advisory on a two more so I had to bite the bullet and buy four new tyres.
It had 195/70 R15 tyres on it - I used that calculator and checked out alternative sizes but ended up buying the same size as they were quite a bit cheaper.
I wanted all year tyres and In the end I ordered some Nokian Weatherproof C from Mytres
https://www.mytyres.co.uk/ as they were £30 cheaper
per trye than anywhere I could get locally. I would happily recommend Mytres but be aware that they ship from Germany so delivery will take a week. They have a list of approved fitters nationwide, and I got them fitted from one of their affiliate fitters just half a mile from me for ten quid per trye.
2011 SWB medium roof 2.2l Mk7 115 T300 in Frozen White. Stealth Camper converted.
"It's better to burn out, 'cause rust never sleeps..."