Beagle and JW411,
I can confirm the position of EI-AFL as we stumbled across it on a trek through the glorious Welsh hills back in 1973. Approximately 2 clicks east of Llyn Gwynant in very boggy terrain.
A few weeks later we stumbled across a small, twisted yellow plate in Craig Cwn Silyn which we subsequently found to be part of a Henley. I presume it is still there.
I did have some slides of these but they are probably in a black hole in the attic.