I never, ever cycle in the UK.
Reason ? In Finland towns have cycle paths everywhere. It's safe. People take their little kids cycling. Lots of people cycle.
In the UK it's appallingly bad in comparison. Some places may have a few cycle lanes here and there for appearance's sake but in the main it's nothing. When you go cycling in the UK you're taking your life in your hands. You're a completely unprotected second-class citizen. A guy I knew died that way, hit and run by a taxi. I certainly wouldn't allow my kids to cycle here.