I been to the Royal Free laser clinic for treatment for Melasma. They are quite good. I think their health and safety protocols are a bit higher than high street places. I asked if they could laser off some big freckles and they refused saying I was too tanned and it would burn. Other places have agreed to do it no problem. I haven't risked it though.
You may have the same issue with laser hair removal, most clinics will get you to sign a disclaimer saying you've not been in the sun for six months and don't have a tan, even if they see you do have one. £80 is quite a lot. You can get £50 for a whole leg in Beauty Works in Crouch End. I think the technology is quite old now, not sure if you need a bang up to date laser.
I like going to the Royal Free though, rather give the money to a hospital than a high st chain.
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