@rds @xandris So dig returns a seemingly sensible response (I can see my domain and my IP in there). The only concern is that I can see:
Query1, Answer1, Authority0, Additional1
Should Authority (I'm guessing this might be related to 'SOA') be 1 too?
(for any other rookies playing along 'dig' is in bind9-dnsutils on #Debian - not installed by default in #DietPi it seems)