don't use this app
signed up and paid for cancellations and selected option for them to do auto booking. In 3 months they did not find or book a single cancellation, despite numerous notifications of cancellations at my test centre popping up on Testi app. This app was supposed to auto book them but in the end I managed to do it myself via DVSA site. Tried to get a refund from DT4A as they had failed to get a single cancellation during 3 months, but they refused, on basis that I had changed my date. So - they take £20 but then don't do anything and then refuse to refund when you manage to sort yourself out. Avoid this app and save your money. Instead, suggest you use Testi to get alerts and then log on yourself very quickly to DVSA site. Took several attempts over a few weeks but this is how I got cancellation.