Wahey .. FINALLY found the rattle when setting off and occasionally when slowing down. Been progressively getting worse for the last couple of months. Sounded originally like it was a pulley, then exhaust at the front, then exhaust at the back, then no idea 'cos it didn't seem to come from the same place every time .. really feckin' baffling.
So this evening I got the Disco on ramps on only one side so it's leaning over, ran the engine and listened .. definitely exhaust ... engine off .. mounting bracket for centre bit is bolt-on and I'd missed it, I always thought the mounts were welded on! So a quick tighten up with a 13mm spanner and Roberts shagging the auntie again ..
I is happy now, and the wife happier 'cos she thought the world was gonna end (again) and cost a fortune!
I also cut up a DVD cover and temporarily fitted (Electrical tape) them to the light-bar lights to see if they work at stopping the light getting into the cabin.