its complicated, but basically in the winter of 1978/79 their was lots of problems with strikes causing all kinds of disruption.
You have period where British Industries where struggling to compete becuase it was cheaper to import, while the unions where demanding pay rises, their was also a lot of corruption in the unions at that time, and really the labour party had become really just a voice for the unions.
It all spiraled out of control and you ended up with things like the 3 day week, where large chunks of the country only had electricity for 3 days a week.
the fall out of which is the country, turned to thatcher, who stripped away the powers of the unions, in order to prevent further large scale strikes, she also decimated alot of the industries that where striking and privatised or simply shut down a large chunks of industry and services.
The short term of this was that things like electricity, waste collection where all returned to normal, and general those who worked in the private sectors life improved. However large areas of the country relying on things like coal mining and manufacturing where plunged into high poverty, a lot of these towns have never recovered.
But you speak to people whose industries weren't effected which to be fair was probably 3/4's of the country, and they view is that Thatcher saved the country from the unions, and it was ingrained in them that strong left wing parties and unions cause are a band thing and causes disruption.
I personally think that they way that crisis was handles is at the root of a lot of the problems the country is facing today. yes at the time the unions had too much power, but you can trace the erosion of workers rights and things like zero hour contracts back to those days. it was also the end of Britain having export Surplus and we have been reliant on imports ever since. Since that time the policy of the government (including new labour) has been support big corporations at all costs and hope the wealth trickles down.
Ill let you make your own mind up about whether the winter was of discontent was handled well or not, but i think its very telling that a left wing party has not won a general election since.