Thanks to all those who recommended getting a wobble board: it has certainly proved a real eye-opener. Basically, I had no balance at all! When I first got it I couldn't balance on the thing for more than 20 seconds, which explains why I am prone to this injury. I'm getting much better now and can do it for about 2 minutes at a push. I can also now balance on it on one leg, which is progress. My ankle still hurts (turned it again 3 weeks ago) but I learnt my lesson. I've since taken the rehab far more seriously and the ankle is starting to get better. I'm hoping to start running again in a couple of weeks (on the flat of course). I may have to give my local hill race a miss in July but at least things are heading in the right direction. Many thanks again.