Hi Fergal. The best advice I can give is not to overthink situations and what could happen. I am now 6 month post op from a snapped Achilles tendon after doing it practicing for the Dunkeld enduro. This is my second full rupture of the Achilles the first being 7 years ago which I then re-ruptured because I came back too soon although the first one was the left leg. I was givin a set of strength tests to do and once I could do them I new I had the strength to get back on the bike. Two years ago I put my handlebars through my chin requiring 17 stitches after a heavy landing on the Matador at Inners. I turned 50 last year and my only concern is that my weight(17stone) will stop my mtb not anything else. If you could do fast,techy,drops and steep stuff before your injury you know you can still do it after you injury that is what I keep telling myself.