Update here as I have had lots of questions re tyres.
Currently running 275/40 ZR 20 106Y Tyres with decent tread across all 4. That said, the van was stood a while before I brought it, and the sidewalls were showing sign of wear as a result.
I ran the van fine for 6 months with them on but sold as seen and would happily allow for anyone to come and take a look at them.
Thanks,
Tom