Further to my previous comment, I've now discovered that my phone is now not even ringing when I get an incoming call or text. I just get the little notification on the icon to show that I've missed a call. I've turned it off as it's completely pointless leaving it switched on.

Same with mine. Admittedly it's a second hand iPhone 7, but until the 14.1 update 2 days ago, the battery was easily managing more than 24 hours on a single charge, even with normal use, calls, multiple daily app usage etc. Now it drains in 60-70 minutes max, even if I have closed all the apps & despite having followed all online tips to maximise battery life. So unhappy. I certainly wouldn't buy a new iPhone next time if this is how little thought they put into their software releases, I was thinking of it when my current contract ends but it's not worth the money. Why bother releasing the 14.2 update when it made it the battery issue worse?