Selespeed stuck in neutral
My 156 Selespeed is currently stuck in neutral. Pulling up to park on Friday morning, the car 'juddered' to a stop and then wouldn't come out of neutral. With the engine running, trying to select a gear results in a clunking noise a few times. With the engine off, the gears seem to select ok (normal pump sounds, gear-selected display moves through all gears).
The same issue occurred last December, but by the time the AA had arrived the gears were selecting again - we still took it to a garage, but they could not see any issues... and the issue had not returned untile now.
The car is currently at a garage (unfortunately, the gears haven't magically come back this time), but they're not sure what the issue is - and are not experts in dealing with this sort of transmission. To help me out, can anyone suggest the things that this could be, or that they could be looking at?
If this garage is unable to help, can anyone recommend a garage in (or near) Milton Keynes that might be able to assist?
Thanks in advance