A quick update in case someone else with a similar injury needs some inspiration in the future. Lots of quite dramatic muscle wasting after the first 6/12 phase of rest/healing but since then, with physio, weights etc. I'm back running on the hills. Discomfort persists, especially after downhill and muscular endurance in that leg is lacking...but week on week small improvements. Managing an hour at a time now. Right/left thigh size is different, but the gap is closing. Also have an awesome new scar to add to my collection (price paid for an active life)!