Welcome to the forum, .calm. What an appropriate user name you have selected!
It sounds as though you got away lightly, given the speed at which you must have been travelling. My daughter once broke a car windscreen with her head (unhelmeted) at a much lower speed and she was OK too. This was when she was at Uni.
What make of bike were you riding? Let's hope that you have no after-effects and that your assailant's insurance co. pays up nice and generously. Are you a CTC member? When I made my claim in 1982, they were very helpful. Pain, suffering, out-of-pocket expenses, damage to bike, helmet, clothing, personal effects. Did a bystander walk off with your Rolex watch whilst you were dazed?
I reckon a really nice steel-framed commuting bike should be high on your list of early purchases. Mercian? Suits you, Sir!