What's an essential service? All tube drivers could decide to take the same four days and the network could not run then. Or all the people who work in my local bank, or even all of those in my local pub on a day of a World Cup game (after all, you only need three days holiday to cover all England games in a World Cup).
In favour but would like this bill to go even further. UK workers' hours far exceed those of other developed countries and allowing workers to refresh themselves little and often or long and rarely as they see fit boosts morale and productivity (especially in innovative sectors). As such I'd call for there to be 10.5 weeks paid holiday per year.
I'm leaning towards an aye for this due to the potential economic benefits - though small businesses in particular should be reassured their overheads/productivity are not going to suffer significantly as a result of this becoming law.
This is in cessation but will be going to vote soon.