Thanks for that Piper.
I have done a bit of googling since I posted and it seems this is 'another' freebie trait. It seems LR didn't use heavy enough steel for the chassis leg and the captive securing nut for the subframe breaks away.
There are quite a few threads on there saying that some folks weld the subframe like mine or cut the chassis leg open from the top and repair the captive nut.
Anyway, once the Freebie is back on the road I will take it to the garage that does my MOT's and see what he says about it. I may have to do the captive nut repair, time will tell. ( or rather he will,
)
Its not that high on the list of priorities for the Freebie...... lol
Gaz