Quavering

I go to band practice each week and I enjoy it enough to cycle with my fiddle on my back for 20 minutes each way in 0°C next to the glaring ring road but I am a total disaster at practising between sessions. I love playing with other people and I hate playing on my own, even though I know I'd be much more use to myself and others if I practised.

Suggestions for motivating myself into practice would be very welcome.