In reply to peebles boy:
There have been several similar threads on UKC. BMC site: thebmc.co.uk/climbing-shoes-is-pain-insane.
BMC says: "High ability climbers are generally more affected by the following reported conditions: Toe deformity – claw or hammer toes, Splinter haemorrhage under nails (collection of blood under toe nails), Bruised toes, Cuts, Corns, Mycosis (fungal infections), Nerve compression syndromes, Hallux valgus (big toe angled towards other toes), Disorders of the traversal arch structure in foot, but normal longitudinal arch, and Bunions."
I've suffered from all the above except probably nerve compression and I don't even have the compensation of being in any way a "high ability climber".
Get the right boots and shoes and probably take advice on insoles too. Sometimes brands have different lasts for different models. Incidentally I recently had a three part op to correct claw toe, Hallux valgus and bunion on my bigger foot which has been a big improvement. If you get such an op consider getting both feet done together to avoid two periods of post-op inactivity.