I was working on the see what else they fail it on and fix it all at once principal.
When the guy rang me he was quite surprised when I asked what she'd failed on before he'd actually delivered the bad news

HOWEVER.....he went on to list both failure points;
Bulb out on main beam (which I hadn't spotted)
O/S/R brake binding (which I also hadn't noticed)
Hand brake passed fine!!! I've been parking against the kerb for the passed 6 months it's so bad and the offending cable is on the near side not the side that was binding!!!
Tyres - advisory - near the legal limit.....more like Kojak's head (younger members may wish to google Kojak for the analogy

I'll get her on the stands at the weekend and give both drums a good clean while I do the cable and pop a new bulb in, but I'm just amazed that's all it failed on, any other members had similar experiences???