Most places in SW and W London charge £35 for a mani/pedi, which includes soaking, cuticle clean up, nail shaping, polish etc.
Treatwell had a £30 'special' with Vos, which I booked. Apparently that's their standard price (not special at all) for 'Express' services-a very basic file/shape and polish only. If I wanted what I normally get everywhere else for £5 more, the price jumped to £55+ for the mani/pedi, which explained why the salon was so empty. The service was fine, way over-priced, and I won't be going back.