Can't get into 5th gear
So my 64 plate 108 with 65k miles on the clock has just decided that it won't go into 5th gear. It refused to go into 3rd for a while but then was ok, at least for the moment.
Before I take it to the garage, does anyone have any suggestions as to likely causes/fixes? It'd be nice to be able to have a sensible discussion with the rather than having blindly accept what they say!
Now, of course, I need to decide whether to replace or repair.