Man of Honour
Although policies change, the overall political stance and beliefs don't change that much. Conservatives are likely to appeal to the same demographic over the medium/long term and that's the same for most of the parties.
If you're a labour supporter, you're likely to be more socialist than a conservative supporter (obviously that's relative, I wouldn't call labour socialist per se) and therefore you're likely to support more of the labour policies and more likely to object to more of the conservative policies.
Some people find particular policies especially objectionable from their own parties and may change, but these tend to be more fringe supporters.
I personally think that parties aren't necessarily good for democracy due to party whipping but it's not surprising that people will vote for the same party for their whole life.
If you're a labour supporter, you're likely to be more socialist than a conservative supporter (obviously that's relative, I wouldn't call labour socialist per se) and therefore you're likely to support more of the labour policies and more likely to object to more of the conservative policies.
Some people find particular policies especially objectionable from their own parties and may change, but these tend to be more fringe supporters.
I personally think that parties aren't necessarily good for democracy due to party whipping but it's not surprising that people will vote for the same party for their whole life.