Meaningless for tech workers in the UK. You quit from a £100k a year job, your £90 a week isn't going to be noticable.
Far more useful is if your employer lays you off (short of major disciplinary reasons), you get at least 1 weeks pay for every year you've worked there (1.5 weeks if you are older).
In the US when you quit it's $0.00. In other countries it's the same benefit as if you had been laid off. We probably agree the latter is the best policy. I'm just saying, other countries have done it. We don't have to guess what the results would be.
Far more useful is if your employer lays you off (short of major disciplinary reasons), you get at least 1 weeks pay for every year you've worked there (1.5 weeks if you are older).