Peter Carson and I imaged the comet last night from Fregenal de la Sierra, Spain and Chelmsford, UK respectively. I got a magnitude of 15.0 using Astrometrica with a 9 arcsec radius aperture and Peter reported 14.8 in a 9.1 arcsec aperture (both unfiltereed IMX455 vs Gaia G).
This comet is well placed for us in the evening sky although the Moon is now interfering. It will be interesting to see how this outburst develops.
This comet continues to fade and become more diffuse following its outburst on Aug 1. Thank you to all of you who have sent in observations. Please keep observing this object as it expands and fades.
The remarkable weather in SE England means that I have managed to image it every night since the outburst was announced on August 6. My lightcurve and a rather jerky GIF showing the development is attached to this post. The comet has now faded to around 15.7. Still a long way to get back to its ephemeris magnitude of 19.5.