I've had numerous bad experiences getting a correct contact lens prescription (I have astigmatism but nothing major) in London at otherwise good opticians, so I don't mess about anymore and I go straight to
20/20 on Tottenham Court Road, who are EXCELLENT and who actually saved my life (they spotted that the bleeding in my eyes was a symptom of something else, which led to my diagnosis and BMT).
But their glasses and lenses prices are insane. For glasses I love
Glasses Direct (the pair I wear cost me £25 total), and for contact lenses I love
Postoptics. When I went to buy more contact lenses a few months ago, Postoptics were less than half the cost of the same lenses at 20/20!
But contact lens solution is ridiculously expensive here in the UK, so I always get friends to bring a bunch back from the states for me. On my last load, two big bottles of Renu in the states cost the same amount as one small bottle here.