Nottingham is actually very good for cycling but some of the big new developments with their huge roundabout one way multi lane systems are a joke, like they totally forgot about bikes.
As above advise
Find the quietest road route even if it’s a bit longer.
Own the road space you’re on.
Big long looks behind you well before any moves you need to make.
Eye contact with the drivers.
Lights all year round.
I run flat bars and ride up high so I can see everything. Can’t stand commuting on a drop bar low down position, I feel very vulnerable.
Oh and one more thing – assume every driver has not seen you and wants to kill you.