My Name is Len Holgate, and I'm a workaholic

Given that the work I do goes on in my head and can be done anywhere I find that it’s often done everywhere. Anyone got any hints on how to switch off?

Skiing and skating are good for me as I can’t think about other things when I’m doing them. Everything else always has the risk of being interrupted by an ‘a-ha!’ moment where a ‘work’ problem is suddenly solved and I need to scurry away to the study to implement the idea… And then you get in the flow and hours go by and you haven’t spent time with people you should.

Suggestions welcome.