@b870d4c8 The normalisation of the extreme-right by the centre-right in the UK went like this.

* We will never work with them;
* But we will adopt all their policies in order to stop bleeding vote-share to them;
* Whoops! We seem to have become them, and trashed the whole country in the process;
* Never mind, the previously soft-left opposition have moved in to fill the centre right space we vacated, so now the voters have no one to vote for* except right wing parties.

* England only 

 @c88dc264 it's interesting how in countries with only a few parties the shifts happen within parties, while in countries with PR it tends to happen between parties. 

 @b870d4c8 indeed. But then the only countries in Europe to use FPTP voting are Belarus and the UK.

Curious, that. 

 @c88dc264 Britain is still using parliament Vista and hasn't upgraded. 

 @b870d4c8 @c88dc264 Exactly. I'm pretty sure that the reason both the Labour and Tory parties campaigned against AV for the 2011 UK referendum was not because of any immediate effects it would have had (very little) but the realisation that with AV both parties would eventually split up. In retrospect we can see that would probably have been over Brexit. 

 @573d6b89 @c88dc264 that's an interesting point, that AV might change how politicians feel about the threshold for striking out on their own, as several did over the last 10 years but disappeared.