Hi Craig. Mine went to Electroflock near Birmingham. Reasonable price and very professional - they do a lot of flocking for Bentley and so on. They weren't quite 100% happy with mine (hardly noticeable minor defects only in the texture) so gave me a hefty discount which I was more than happy with.
Just make sure whoever you use is using a proper high-voltage electrical flocking process not just a glue-and-scatter. The latter approach is by most accounts rubbish.
I went for black, 0.75mm. I looked at a few other colours at the factory but the dark grey just ended up looking like cheap carpet tiles. I wondered about a really rich blue or something but I chickened out
The galre would have been worse too.
Richard