Old Android phones for app testing (Plumstead SE18)

I'm a software developer in London looking for unwanted Android smartphones to test an app across different real devices and Android versions.

Old, slow or cosmetically damaged phones are fine - cracked screens, worn batteries, damaged cameras/back glass etc are not necessarily a problem.

Main requirements: powers on; can connect to Wi-Fi; isn't locked to somebody else's Google account/FRP locked; can install and run apps.

Especially interested in phones sitting unused in drawers that aren't worth the hassle of selling. Happy to collect locally in the Woolwich/SE18 area.

For software testing, not resale. Thanks!