yet more info (following first physio session)

I must say how enlightening physiotherapy can be when done by an qualified expert.

Only indication of possible rear Wikipedia reference-linkmeniscus problem is pain when the outside joint of the affected knee is pressed hard. All other parts of the knee pass all the physical tests. Physio reckons it is more likely to be a sciatic problem (as indicated by the numbness from the lower spine area). Being an I.T. worker the office chair (which is wrong in so many areas) is the prime suspect.

I have a number of daily exercises to do, which I will launch myself into asap

I'd love to have one of those machines that passes a current through your knee, I'd wear it 24/7 !