My location is shown as London and I am not in London

You need to change your location settings on the phone and is not to do with the app you are using.

Go to the settings and click "Privacy & security". Then click "Location settings" and then find Paua in the list of apps. Make sure that the setting is either "While using" or "Always"

Visit "Settings", "Personal" and "Loction access" to change your settings

Try this article here