It seems to me Willo, you(Cons) are running scared of Farage, same as Lab. It also seems to me, that he's doing all the things you wanted to do, but, failed miserably. Relying on your 'blue-Rinse' brigade etc to vote for the Cons has failed, as you have alluded to. Yes, Farage may be all 'bluster' as you call it, but, he has galvanised the voters, whereas the Cons/Lab are just going along as if nothing has happened.
Still, politics is a funny beast, everyone slags off everyone else & nothing gets done. there may be 4 years to go, but, it's going to take a lot longer for the Cons to become a credible party again. Lab will get voted out, no matter how many immigrants they give votes to. Not a dig at you personally, just an observation.