They use P&P cages on the test vehicles at work, the bends are nice and well formed, and the welding seems good. Not seen a rolled one tho, yet
Before using P&P there were some cars fitted with cages that carried the plate "Custom Cages" i have no more info on them or where abouts they are, but as the name implied they were custom, and looked top-drawer
The flatpack cages at Sodbury were from Whitbread Offroad they seel on ebay a lot but the cages are not cds or mandrel bent
You pays yer money . . .
Lewis
P.S. Ive got a new Truckcab cage for sale, originally built to suit an 88" chassis, unknown manufacturer but it is log booked and built to MSA spec (or so i was told when i bought it from GB Developments who advertise engines in the LR comics) Its just lying around unused as i have gone station wagon rather than truckcab on the 90. I have the chassis mounts too