Oh, I don't disagree that it happens but I'm not 100% convinced it should happen.... I'm on the fence with it as there hasn't been any decent argument either way.
The argument put forward that the economy would melt down has merit but only due to the pension then not being spent back in the UK economy. The difference in inflation rates between countries doesn't stack up as, if the recipient resided in the UK, they would get that increase so the overall cost to the pension "fund" would be the same... It's the drop in the amount going back into the economy that would be affected (semantics, perhaps, but it's true)