This is my last post on this thread now although if I find the owner I will post an update for those many posters who helped with good suggestions.
In the meantime to save more posters saying the same thing:
Yes I regret picking them up - had they been on a bench I wouldn’t have done so. They weren’t visible on passing. They were in long grass which is mowed every month in the summer. We sat and played there which is how we found them. But I do regret taking them home although I don’t think leaving them in the long grass was a great idea either.
I genuinely thought they were cheapies and was not pleased to find they were expensive, costing new £185. I feel for the person who lost them. I want to reunite them with their owner.
They may be prescription but if so, very weak reading glass varifocals. I’m not able to tell.
On the suggestion of several helpful posters, I have started my first ever Facebook page and posted on the nearest community site. I’ve had one response so far - not those glasses sadly. I didn’t specify make or colour in post.
I have posted in a lost in London site - one response, not the same glasses or park sadly.
I have emailed the park rangers - no response yet.
I have been on Met Police site for advice. They said low value unidentifiable item found - dispose of yourself if you can’t see them and these whose item it was. High value - take to police station. This will be my last step of Facebook and lost in London site posts don’t work.
I have been called a liar. I have been called a thief. I have been called strange and weird and filthy.
I have also been helped by some lovely posters.
I did ask for opinions so I’m not complaining but it has been an eye opening experience about how people feel and behave. Thank you all - and I’d now appreciate it if this thread could sink, although I realise that is not my right to expect.