drove home from the other halfs this morning. couple miles in, my box decided i wasn't going to go into the rear gears (2,4,R). stopped, had a fiddle, all seemed well. thought it might be a stone got in around or something, as they have layed a load in the backlanes.
drove on, all was fine, til the last couple miles. now it will go in gear, but every time the let off the throttle and engine brake, it jumps out

so.... syncros or selector fork?

great birthday present