Its amazing, how many people you talk to who thinks all this is BS and the system is totally screwed, however it always translates to fuck-all votes at the polls.
For clarity: The upper house (the House of Lords) is appointed, rather than elected. The instant runoff voting was used to select which hereditory peers would be allowed to remain sitting in the house after the number of sitting hereditory peers was reduced to 90 in 1999, with the electorate being other members of the house.