I switched out the router and things started working. Very weird, but I can’t tho jot anything other than it being the Virgin Media hub not liking it. Apparently they have history on this.

Thanks for replying, I appreciate the response.

I’m running dig @192.168.0.249 study.lan from my client (a MacBook).

If I run ‘dig @192.168.0.249 study.lan TXT’ I get a correct response (I have added a txt record)

If I run ‘dig @192.168.0.249 lan SOA’ or ‘NS’ I correctly get the records for the zone.

I think this eliminates the possibility of it being a routing error?

Better than that, if you are after more than one (and with GU10s, who isn’t?)

https://www.ikea.com/gb/en/p/tradfri-remote-control-kit-smart-wireless-dimmable-white-spectrum-50517642/

This gives you 3 bulbs and a handy remote that also works with HA.