It usually costs a fortune for regulating anyway, it seems cheaper to buy newI’ve been going to Vision Express for years and usually spend a couple of hundred on new frames and lenses.
The last time I got my eyes tested, they recommended the new prescription. As I was on mat leave and a bit skint I asked them just to put the new lenses in my frames and they refused!
A friend had told me about an online shop called Iolla, you input your prescription and pick the frames. £60 for everything. I think if you needed then thinned down it was an extra £5. I will never buy a pair out of a high street shop again, absolute rip off.