The Tories are proposing two changes to the law around industrial action. Ballots to strike would need 50% turnout among eligible voters. And a strike affecting key public services would need to be backed by 40% of eligible union members.
That is a serious but not insuperable barrier to striking. How easy it is for each union to get over the line will vary from sector to sector, union to union and strike to strike. It will also depend on whether text or online voting is allowed.
But, to be honest, striking is already pretty rare. Here is the historic tally of days lost to strikes. (Can you spot the General Strike?)
Here's a more recent timeline.
Drilling into the 2013 and 2014 figures, by the way, also illustrate something quite important. Under the Tory plans, health, transport and school workers would need to meet the higher bar - 40% of members voting for the strike plus a 50% turnout.
These sectors do tend to strike more than average. So the separate rules for crucial public sector workers, if it bites, could affect the sheer volume of striking much more than the proposed blanket rule on turnout.