I see in the introduction that this specification is for "amateur built helicopters", but it looks like one-off experimentals are not accomodated. There is enough near-destructive testing required that only a kit manufacturer willing to produce a sizeable run could meet the requirements. From what I know of Rotorway or CHR (not a lot), there is no current documentation of ultimate loads, etc., so even these manufacturers would have to do a lot of testing to be able to sell into the UK.
And they deliberately exclude the sexiest designs: The Jet-Exec and the Helicycle!