I wouldn't call you out for it, you would be right had I asked this without having a clue but I haven't stated that anything I'm doing is drastically any different to what others have said. I was just asking a question as I felt maybe the wording in the regulations could portray a different scenario.
The RCD query was more to ensure I wasn't missing anything obvious as I am trying not to overspend on the job.
And obviously the earthing question was more as I've never worked with mobile homes/caravans and its good to get some more background from those that may know more about it. Albeit it seems that what I 'knew' to be correct, is.