I would imagine that the majority of the British public couldnt care less about the Peel register or Rumcars,therefore it wouldnt get mentioned,just like how every other car tested by them doesnt get a list presented of all the clubs you can join.
And the behaviour of the people who came in contact with the Peel is pretty representative of everyone who isnt in the low membership of the rum and who knows what it is,which is why i stopped driving a Reliant,you couldnt go anywhere in it for fear of it being on its side when you went back to it.