Having used and operated out of LTN for several decades, I’m no fan of the airport and all of it’s faults that are mostly in my mind due to cost cutting. There is much criticism above of the airport’s handling of COVID and passenger segregation but of what I’ve seen of some other airports in Western Europe recently, LTN airport is doing at least as good, if not better job than most.
The airline involved seemed to be genuinely trying their best as well to provide segregation when possible but the passengers generally seemed to not always be helping matters.