I had to see what this was about ... apparently this last happened in 1974 where neither major party had control over the House of Commons (?).
The BBC had a good (short) article about it
here with a 5 slide graphics presentation.
I echo the sentiment to hang all politicians ... they are worthless to me ... here in the US they vote to give themselves unrealistic raises each year, and then vote to give us pensioners a 1.7% raise as the cost of medical insurance has risen 14%, as mine has.
Hang 'em all ... :cheers: