Squeezed the car into my garage and stripped off the front part of the undertray for assess. Eventually managed to get my arm in and pull the H11 bulb. Nipped up to Halfords in SWIMBO's Clio, and bought a new one.
Fitted the bulb into the holder and tried it before going any further.
The new bulb works fine, but THE OTHER SIDE one is now not working. OK, so maybe not the bulb, so I fitted the old one back into the holder and it works!!!!
Still nothing from the offside one.
Strange situation, and quite beyond me. I don't want to strip off the other side of the undertray as it's a pure B*****d to get in to the bulb, and all done by feel.
I don't know how I'm going to get the nearside bulb holder back in and the tray refitted yet so dismantling the offside. is scaring me. Any ideas as to whats gone wrong?