In the UK, the CAA regulates and authorises flight schools as either ATOs or DTOs. There is no practical difference for helicopter PPL training or type ratings.

Lists of ATOs and DTOs are published on the CAA website. This map has been built from that information. It's provided here as convenient way to search for a helicopter flight school, but note that this comes with no warranties about accuracy or completeness and it is not updated frequently so it may not have the most up to date information!