On what basis do you compare him to Winston Churchill?
Good question. Let's compare:
Churchill: First Lord of the Admiralty. Neville: Deputy Sherriff of Berkshire.
Churchill: Prime Minister. Neville: Ambassador to France.
Churchill: prevented Mosley and other plotters from overthrowing the government. Neville: plotted with Lord Devereaux to stage a coup.
Churchill: lost in his attempt retain the Prime Ministership. Neville: lost in his attempt to become Home Secretary.
Hmmm . . . not much basis at all, apparently.