What is mentalist is when parties promise something at General Election time and almost immediately the election is over start to back pedal rapidly.
But I think you are misunderstanding what I said and you also misunderstand the ERG which actually includes some remain MPs and is used incorrectly by many commentattors.
Like it or not, there is a Brexit Party set up I believe to fight in future elections should the Government botch Brexit.
I think it will mop up a lot of "none of the above votes" and there will be lots of them up for grabs as a high proportion of the 82% who voted Labour or Tory will feel ripped off at the moment.
One of the fastest growing parties is also the old SDP which is a Eurosceptic, centrist party that supports PR. IT may be able to grow support but at the moment has no profile with the public.