Any advice please for online prescription glasses.

I would be interested too. I recently sat on my good pair and I would love a couple of inexpensive pairs to have in reserve.

I tried online glasses once and wouldn't recommend them.
Unless you have a very simple prescription you will need precise measurements that the optician takes as well as your prescription.
I wouldn't worry about visiting the optician as they are taking all necessary precautions.
Do you have a Specsavers nearby? In our local branch they have placed the reception desk at the front door and chairs for waiting outside. Please ring your optician and tell them your fears.

I’ve used Glasses Direct before, and found them easy to deal with. You need a prescription from an optician though, and it’s a bit of a faff to set up your account in the first place. You have to send a photo of your face with a credit card (an Advantage Card or similar will do) positioned on it, so that they can measure the distance between your pupils, but once that’s done they keep it on record.

Their range is good, and they do work out cheaper than the high street, but not as cheap as the adverts suggest, by the time you add on all the necessary ‘extras’.

I've used glasses direct, I am really pleased with them just make sure you do a good measurement between your pupils so that the glasses fit well.