Dodgy Datapoint showed up in data for heat. How to delete this data point?

Can anyone assist with removing this data point? I have searched how to do this but only come up with posts from 5-7 years ago and they don’t explain how to do it. Surely this has happened since then? Really screwed up my SCOP rating this morning as I’ve lost nearly 6000kWh of heat energy in an day.
Looking simply to delete that dodgy data point and hopefully someone can breakdown where to go to get it done. :+1: