While I will always be happy to see a left leaning party in power after the past 14 years I am under no illusion that this is a sign that the country is moving to the left. People just want something different to the shower they have had for all that time. Left or right doesn't come into it that much, as shown by the Sun backing Starmer.
There are just a small number of issues that will be core to the result; prices, NHS and, sadly, immigration, and if Starmer doesn't show the tangible improvements people want to see in those things in the first term, despite his warnings that it will not be a quick solution to our problems, then there may well be a reaction in the future with Reform and its influence on Tory politics growing in strength.
We are not immune to the sort of stuff that is happening in France and other EU countries.