Sent my 2 day test off, got the results very late the following day - they had received the test in the morning, and I got the result in the middle of the night. Expected similar for 8 day testing, found a priority post box that had a Sunday collection. Test was sent 24 hour priority with Royal Mail. Tracked it, yes, collected on the Sunday, was then sent to Croydon for some reason, where it sat until the Thursday. Got the results on the Saturday night - so nearly a week later, and by which time I had flown home.
The test company said that I was free to go after 10 days self isolation, but the government website said I should continue to self isolate until receiving a negative result. As I’d come back for a funeral and a hospital appointment I went to them and then flew home. But I’d paid £150 for these tests, which were essentially useless. Company don’t want to know and are (rightly) blaming Royal Mail. Fortunately I’ve been vaccinated and both tests were negative.