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Not quite sure what you expect Nigel to do in a practical sense Howard, and as for not wanting to put his head above the parapet that is just exactly what he has done all of his political career.
In respect of doing anything practical, he has previously offered to assist the government in any way he can but they have rebuffed that offer. They refuse to talk to him and no doubt hate him as much as the EU elite do. They have never asked or requested him to work with or advise any government Brexit group even though he obviously has a vast knowledge of the way the EU works etc.
Likewise, they made no attempt to contact him prior to or after his meetings with Trump even knowing that he had the president’s ear. They just can’t bring themselves to have him engaged in any way, shape or form. That’s not his fault is it?
Other than that, the government make policy that no doubt the civil service are supposed to make work, that’s their job isn’t it? Perhaps if some of them actually got off their bloated backsides and believed in what they were tasked to do then they might even possibly earn their honours, knighthoods and gold plated pensions!
Finally, with regards to your comment “Over the last two years all we have had from Nigel and chums is stuff like "Brexit means Brexit", "Leave means leave" with clichés like remoaner, will of the people, cast off the shackles, treachery of our Government etc etc.” I can only assume that you obviously missed all of his many tv appearances, radio shows, newspaper articles etc., etc. , whereupon he’s gone into great detail in answering and discussing all the relevant questions appertaining to Brexit.
What else is he supposed to do?