Plant species were also noted; Julian photographed a Southern Marsh orchid - identity now verified by Peachysteve.
On our way back down the road, Steve and Charlie spotted a Ruby-tailed wasp, which Steve managed to photograph very well in spite of the insect buzzing around at high speed.
It was a great ramble despite the heat, and - as always - it was a wonderful privilege to be walking with experts!
(Possibly) Southern Marsh orchid Julian Birkhead
One of the many exquisite scenes we saw along the Ryburn Julian Birkhead
Yellow Shell moth Julian Birkhead
Ruby-tailed Wasp Chrysis ignita SB
Charlie Streets explains it would have been searching the cracks in the wall for other wasp nests or those of mining bees to parasitise. Only about the size of a bluebottle fly, it must qualify as one of the most superbly-coloured insects in Britain.