That's something well worth knowing, Ewan. (If we can interpret it correctly) Nice one.
Regulation 2(5), copied below, looks like it could work for us or against us, depending on the circumstances.
(5) The common duty of care does not impose on an occupier any obligation to a visitor in respect of risks willingly accepted as his by the visitor (the question whether a risk was so accepted to be decided on the same principles as in other cases in which one person owes a duty of care to another).
For example:
If, when presented with a difficulty, you say "it's no problem" and your ladder slips, or you over-reach, or you ‘trip’ or step off a garage roof – it’s your own fault.
If they 'persuade' you into taking a risk e.g. saying they'll 'steady' the ladder - it's their fault
Also, if they suggest that it’s OK to walk on their garage roof, or lean your ladders against a structure ,and you then fall through the roof, or the structure collapses – it’s their fault.
Do you think I have got it right?
Mike