Economic change insulated third parties from strikes in the 1980s more than the 1970s. Britain had more vans, trucks, big roads, and trade with other countries (even Poland). I don't think the unions lost from others' psychological readiness, as much as the migration of middle-earners away from manufacturing jobs associated with Empire, like making big ships, towards self-employment in many cases.
Back on topic... I think the 1923 election was another regretted one.
As a side note and slightly off topic I think the Labour leadership election of 1980 is one of the pivotal moments of post-war British politics.
As we know in the original timeline Michael Foot surprisingly won the leadership ushering in a divided centre left vote and locking the Tories into power that would last until they were crushed in 1997.
In an alternative (and saner) timeline Denis Healey wins, there is no SDP breakaway and the general election that followed (probably in 1984 because the polls would be a lot closer than in the original timeline despite the Falklands war) Labour actually has a chance of winning.
Remembering that unemployment would still be rising (in either 1983 or 1984) and would only peak in 1986 I think it would be a difficult economic record for the Tories to defend in the country.
How about this for a formidable Labour shadow cabinet:
Leader: Denis Healey, Deputy: Michael Foot, Chancellor: David Owen, Foreign Secretary: Shirley Williams, Home Secretary: Roy Hattersley, Defence: Bill Rodgers, Health & Social Security: Peter Shore, Education: Neil Kinnock, Environment: Michael Meacher, Energy: Gerald Kaufman
My guess would be both the Tories and Labour finishing on about 38% of the popular vote meaning the result would be very close to the February 1974 outcome.
One of the great might have beens of the last 35 years...