If they are the same spaces as on GWR, then if you have the whole space a standard length diamond frame can be put horizontally in the space. Once you've removed the pram and whatever else you find in there already etc. If yours is the bike furtherest away from the corridor then even with a DF hanging up, it's necessary to remove the nearest bike first, before extracting yours. As for recumbents on trains, we are doomed if this becomes the only way of taking your bike.
It really doesn't take up much more space for bike to go horizontal with all their bits attached. Why oh why they can't use the same design as some Thameslink local have round here I don't know. Two bikes, strapped together, or four fold down seats with bikes taking precedence. Long enough for a Nazca Fuego, on its kick stand, mine is 2.05 m long.
I despair...