Just putting the news out there as I read it about 1,000 private contractor workers (check-in staff and baggage handlers) at Gatwick have voted to strike. As of now dates are July 28 for 4 days, and then Aug. 4 for 4 days. Airlines affected are British Airways, easyJet, Ryanair, TUI, WestJet and Wizz Air.
There was also a thread put up earlier today in the England Forum with other helpful comments https://community.ricksteves.com/travel-forum/england/gatwick-airport-baggage-handlers-strike