Took the ES V8 Disco in to investigate if exhaust centre could "gut" the catalyst that was rattling but apparently there is one you can get to and one you cant - guess which ones gone on mine. Also the mid and rear boxes have pinholes so the entire exhaust is shagged!. new cats £300 and the rest of the exhaust £130 !
Good news is though - I went to a local MOT centre who is also a LR nut to ask if I could get the lump through it's MOT without cats ( thanks Badger for the pointer) and yes if I present it on LPG its tested on LPG and bar a major issue with the engine it should be fine. Evan better he pointed me in the direction of a local guy who custom builds stainless exhausts, he's building me one right through on Tuesday for £350 - lifetime guarantee too boot. stainless system fitted for less than the price of a mild steel standard rot tube!!
this is turning out to be open wallet surgery though !