For UK disabled followers and friends:

Google is recruiting people to become  members of the #accessibility Trusted Tester Program. So far, members have been from U.S. and Canada. Testing of Talkback and other studies take place  through this program. You can be a tester for on-going  products like Talkback or take part in research studies that will be posted. You'll be paid for your time for most of the studies.

Signup here to express your interest (UK only). https://g.co/a11ytt