In 1997 Labour's manifesto stated:
We are committed to a referendum on the voting system for the House of Commons. An independent commission on voting systems will appointed early to recommend a proportional alternative to the first-past-the-post system.
The Labour government set up the promised commission, chaired by Lord Jenkins, this reported in 1998. The Jenkins report proposed a new Alternative Vote Plus system, that sort to balance the criteria of stable government, constituency link, voter choice and broad proportionality. The fact that this system required a wholesale boundary review was used was used as an excuse for the delay in holding the promised referendum. The real reason being Labour's massive majority, and the reluctance of most MPs to reform a system from which they benefited.