A&A run DNS over HTTPS (DoT) and DNS over TLS (DoT) resolves. There is information here: https://aa.net.uk/dns which includes information on privacy and the terms and conditions.

As of September 2019, this is considered a 'trial' service, but is expected to continue and be an 'official' service for customers.

Service	server	Description
DoT	https://dns.aa.net.uk/dns-query	Usually set in your web browser, where supported.
DoH	dns.aa.net.uk	Usually set in your operating, where supported.
Standard DNS	217.169.20.20 217.169.20.21	Our standard 'port 53' servers.

Help with browsers and devices

FireFox

Menu
Preferences
Scroll down to Network Setting...
Scroll down and tick 'Enable DNS over HTTPS' and enter in a Custom provider: https://dns.aa.net.uk/dns-query

Checking your browser

In your Firefox URL bar, type: about:networking and enter. Then click DNS on the left, and you should see your DNS lookups, and they shoudl have TRR (Trusted Recursive Resolver) listed as true.

Chrome

DoH is expected to be a feature in Chrome version 78

Android (DoT)

DoT is supported in Android version 9 and up

Settings
Search for “DNS” in settings search bar
Go to PrivateDNS setting screen
Tap 'Private DNS provider hostname', and Set: dns.aa.net.uk
Click Save

Using DOH with curl

Note: curl version 7.62.0 or above is required, here's an example:

curl --doh-url https://dns.aa.net.uk/dns-query https://www.aa.net.uk

This will download the www.aa.net.uk webpage but would have used the DOH server to resolve the DNS.