There seems to be quite a few operators. I'd prefer one that goes with smaller groups than the ones that take up to 24 people at a time.
Any recommendations of which companies I should consider?
I'll need to contact them in advance to check suitability of me going as I have a visual impairment and can impact my balance if having to walk quickly on uneven ground or through forests with lots of obstacles. I'd like to go but don't want to end up being a pain in the proverbial for other people!