Not that i was looking (!) but i noticed someone with what looked like stocking type leggings to go under bib shorts ie separate leggings from ankle to groin only. Assuming i am right in what i saw any idea where i could get some?

leg warmers.

from asoss, adidas, nike, skinfit, well just about every clothing manufacturer actually....

Most bike shops will sell them.
Leg Warmers are normally around 25, armwarmers at 15. Having said that, Rapha have a very nice pair of armwarmers for 30. Well worth the money in my opinion.