I did it, but do not fit easily into the survey presumptions. I am a high-ish hours glider pilot but low hours (and no longer current) PPL. So No IR or IMC, never file an IFR flight plan (or any other sort –
AFAIK, no UK glider pilot files a flight plan, certainly not in ordinary circumstances).
But as a glider pilot, I am used to field landings, so I would be willing to proceed into an area where I might not make it to the destination but if all else fails, the ground ahead in the pictures appeared to hold a good chance of finding a suitable field.
Also, I have been IMC in gliders (in spite of having no PPL-type added rating) enough times to not worry about an individual cloud that might develop a bit more rain. That is partly a matter of experience and judgement as to how serious it might become – imho, the pictures are not very frightening – but they probably should be for a low experience, no-IFR, pilot.
I’d be interested to know what others think.
Chris N
PS just seen Mad Jock's comments, and agree.