Ref the recovery from these ATC strikes, I’m presuming there are no changes to the curfew timings?
If not, considering probably 500,000 passengers minimum have been affected by this issue, the airports not just Heathrow should be cut some slack. And should be the same in any other exceptional event like snow for example.
Ryanair for example are operating some “rescue flights” but with every flight running at capacity it’s going to be days before everyone gets back. Being the last week of the school holidays, flights were probably already at 95% of capacity at least in some cases and you could genuinely see some people not getting back within 7 days.
You need to try and get some more capacity in the system somewhere.