Look on the tyre sidewall for a format like 235/65 R16, or check the sticker inside the driver door area. Use that exact size in the manual search to see matching options.
Often, yes. Many Crafters require higher load indices and sometimes commercial (C) or reinforced construction. Match or exceed the load index shown on your current tyres and follow your vehicle handbook guidance.
After selecting tyres, you can choose a nearby UK fitting garage, then book an appointment time. The garage fits and balances the tyres; you simply attend at the scheduled slot.
For cars and light vans in the UK, the legal minimum is 1.6 mm across the central three-quarters of the tread around the full circumference. Many drivers replace earlier, around 3 mm, for stronger wet grip.