At last a clear night - albeit with bright moonlight.
I started off looking for comet 141P/Machholz (near Orion), but it seems that it has faded down too faint (possibly 14th magnitude?) for me to detect.
But then I slewed around towards Cassiopeia, to look for C/2019 L3.
This is yet another comet discovered by the ATLAS programme and is up to 12th magnitude: