@MrsPuddle
You don't have more money, you just stop working for very small wage.
Let me try to explain:
Let's assume you're on 125k. Let's ignore pension contribution for simplicity.
Your take home pay is 78k.
You drop one day a week and get 100k - take home pay is 68.5k. Assuming you work 47 weeks (25 days annual leave), 4 days/week, your daily take home pay is £364.
You add fifth working day each week in previous 125k scenario and your take home for that extra day is only £202. This daily rate of take home pay is equivalent of 64k gross. For many people in this position their free time is more valuable to them.
If you add here lost childcare support, esp for more than one child, then you're actually paying for privilege of working.
Now, assume in previous scenario of 125k you're able to drop 60k in your pension now. This is great for 50+ as you can take it in a few years time, pay off mortgage if needed etc, so many higher earners in this position continue working for some time.
I'm certain Labour will be nasty and either reduce annual allowance or rate of relief or tax free lump sum or all of this. Again, the delta you'd be working for is not worth it. Let's don't forget that one doesn't suddenly become high earners in 50s, people normally reach this position earlier so likely to have some savings/assets by then. It will make perfect sense to reduce hours/retire to enjoy life whilst you're still fit instead of continuing working for very diminishing return.
So by trying to take more government will end up with less.