Cheers Geoff, #18 was on a felled tree buried in brambles about a foot up in the air - so moved the brambles away and tripod at no leg extension was perfect height #19 was a bin bag on the ground to kneel on and tripod flattened - to get low down - harder work - especially the getting back up !
This one eludes me for ID at the moment - when I get more time to sit with the book in front of the screen will try to get it sorted -