The launch of a new system to reduce quarantine requirements has been marred by problems with coronavirus testing companies. From Tuesday, travellers arriving in England can end their self-isolation if they pay to take a coronavirus test at least five days after they land, and get a negative result. But several of the 11 testing firms on a Government-approved list published on Monday night are facing difficulties providing the Test to Release service. One company, SameDayDoctor, asked to be withdrawn from the programme. It posted a message on its website stating: “Unfortunately we have been so overwhelmed with requests for Test and Release that we cannot answer any more emails nor take any more bookings.”