OP
Octopus
I suggest you check guide 6 here:
Best practice guides : Electrical Safety Council
especially the flow chart inside the back page.
So you leave a BS3036 board in place rather than install a dual RCD board because there's no bonding?? Don't get me wrong but I'd argue that the dual RCD board is much safer than the 3036 board, and we're supposed to be making sites safer.