The reason I ask is that I am a picture framer and would be willing to frame up, at my expense, a GOOD photo or painting, and not a tiny postcard sized one but as large as one might reasonably blow it up to with good definition, and then you/we could present it to the club. I suppose we need to know if they already have one, maybe they do, but I'm just trying to be useful, especially in the present circumstances of the restored grave in London. Perhaps you could be forthcoming with some info.
Turvey Tyke is your man, I'd say. If you can find an original photograph, it's amazing how they scan and enlarge.