There are many websites to buy glasses online in the UK.

1.Select specs

Seclectspecs is an online glasses website with a comprehensive range of styles. The main products sold include optical frames, sunglasses, contact lenses, accessories and tools related to glasses. Most of the glasses are relatively cheap. Free shipping service.

2.Specs-by-Post

There is also a Specs-by-Post that is also cheap. The styles are relatively basic, and they are all around ten or twenty pounds. The disadvantage is that there are no relatively high-end series. 

3. Koalaeye Optical

Koalaeye is a professional online glasses company. Their glasses and delivery are very fast. There are many styles of frames and reasonable prices, which can satisfy people of different consumption levels.(Website: Online Eyewear Store | Prescription Glasses | Prescription Sunglasses )

4.Glasses Direct

Glasses Direct is a mid-to-high-end glasses website. Compared with the above two, their glasses are a bit more expensive, but they are not too expensive, most of them are around one or two hundred pounds. 

5.Vision Direct

If you want to buy contact lenses, then you can go to Vision Direct, which is an inexpensive and often discounted contact lens website, and they are available in a variety of colors.