In reply to abcdef:
I had a tent, with decent vertical ends, which was 200cm. It was fine for me at 178cm tall, but only just by the time you add sleeping bag hood etc, and I'd say I'd want an extra 5-10cm generally.
My current tents are 210 for my lighter one which is perfectly adequate, and 230 for the other one, which is really nice to have.
For Wilkesley at 6'2" (188cm ish), I'd say allow 30cm so maybe 220 comfortable, you'd get away with 210 but it would be like me in the 200, a bit tight with hood or toes of sleeping bag touching the inner if you don't stay perfectly in the middle all night.