Will you still be riding in 5 years?

fatboyralph im up for a south downs mtb run guys if you can get that organised. but not fixed. as much as i like riding fixed, i love going down a singletrack fast

Done and done. I'm using a SS mountain bike hub with an ISO mounted Spocket for the fixed so fast will also be doable if I can be arsed turning the wheel around.
As for the drop offs/jumps who knows. Could just prove entertaining whilst doing it on fixed (Better find my helmet).