I think you should consider that those tests are included in the hotel quarantine costs. Trying to manage hundreds of detainees individual test bookings would be a nightmare - for one thing they'd have to know where they were going to be holed up several days before travel just to order them - so much easier to just do them on site.Interestingly the rules for those coming from the 6 red countries came into effect at 4am today and appear to be 10 days in an hotel plus NHS PCR tests on days 2 and 8, not paid for ones.