Cheers Karl due to the inaccessibility of that nut I guessed that but many thanks for confirming it for me. Always good to get advise from an experienced mechanic
Ok so I have an update if anyone's interested. Due to me needing the van for work I've done a tempory fix which should by me some time in till I can find someone to repair it long term.
SO I carried on drilling through the bolt but as expected due to me drilling slightly off centre once I got through the bolt I could tell straight away I had inadvertently drilled off the thread on one side of the nut. I was gutted as I knew I couldn't get a new nut on top of the welded nut as there's very little room due to the steering rack being directly above it. I had a think about it and got my BOSH cordless multi tool out. There wasn't a lot of room so I removed the bracket that connects the lòwer gearbox mount to the gear box. Now I had room I used the multi tool to remove approx half off the welded nut. I could only remove half off it as there's a slight up curve on the subframe stopping me completely cutting the whole nut off flush with the subframe. My mate drove me to the DIY and shop and i bought myself a bolt and a captive nut (with blue ring insìde). The bolt i got was long enough to go all the way through the mount and about 10mm through the welded nut which aloud me to get the new nut between the steering rack and on top of the new bolt. I put the mount in place, put my new bolt in and tightened the new nut up (without snapping it). Then i put the gearbòx bracket back on and put the bolt that's secures the mount to the bracket and tightened it up.
