The physio had suggested that I could try a local orienteering evening so that I'd run an event but it wouldn't be too hard on my legs and ankles. I went along to Bingham park after work and ran the orange adult circuit. That was fairly straightforward, the navigation was obvious and the terrain reasonable. My time was nothing special as I wasn't rushing. With that moderate success I tired a 'Sprint' route. That was much harder, the controls were difficult to find, the navigational features subtle and the terrain underfoot uneven and often steep. The Sprint was nominally half the distance of the Orange and took me 10 minutes longer!
For an hours run it was very varied in pace, gradient, terrain which is a good training environment. I thought that might make it leg-friendly but my ankle is a bit delicate now. Hopefully some lower leg rolling, Ibuprofen gel and sleep will improve it.