That sounds fantastic, @harvey186.
I know that you dislike this topic, but it is and remains an urgent topic in view of the rising C-infections.
Which microG Services Core version is included in your new Q-GSI build: current stable release 0.2.12.203315 or older releases as 0.2.11.202414 or still 0.2.10.19420?
The third build of LineageOS-17.1-for-microG for S9 (starlte) and S9+ (star2lte) from 25.09.2020 is equipped with microG Services Core version 0.2.12.203315. Among others, the (UK) NHS Covid-19 app version 3.6 (68).68 from 23.09.2020 works with it.