young Ed
Veteran
it is still law for land rover drivers to wave to each other, anyone driving a real land rover (not discovery mk3 onwards or range rover) from 1948-current day have to wave to each other. in fact even though i don't even own a land rover yet but still love them and dressed up in school uniform on foot i get a wave back from pretty much all land rover drivers i wave to, not so for other carsMotorists used to wave to each other until there became too many. More recently, Alfa Romeo drivers used to wave at each other - that stopped when the 156 and 147 sold well and meeting another became more common.
and for the OP, i wave at all cyclists apart from the yoof in hoodies and a swag cap or anyone else on a BSO and weather or not they wave back to me i don't really care.
one thing i do care about is when i have pulled over, off the road, and stopped for a car in a small lane and they just drive on with out nodding, waving, flashing lights, tooting horn etc i get rather peed off and make sure i never pull over for them again and stop them from overtaking until safe to do so
Cheers Ed