As many people on here attest, this is not a reliable service. Despite the promise of next day delivery, the test did not materialise, instead arriving a day later. Understandably I panicked, having an expensive plane ticket to the USA on the line. So of course I booked another test with another provider and requested a refund. Refund was refused - I was told the late delivery was the courier's fault, but that's not good enough: that is Official Rapid Tests absolving itself of any responsibility for false advertising. The key point here is that Official Rapid Tests is misleading customers by presenting itself as a next day delivery test provider when this is not guaranteed. Why? Because they want your money, and offering next day delivery sets them apart from more ethical providers who quite rightly do not guarantee something they know they may not be able to deliver. The conclusion is that essentially this is a dishonest company who care more about your money than your distress or the damage that may be done to your travel plans. Avoid at all costs and choose an airline-recommended service instead.