My local mast is still showing the same as its done for a month or so:
"We're aware there's been a network problem in your area for some time. We're really sorry if your services are affected – we're doing all we can to fix it. We've recently upgraded this site to improve the 4G service from it, but unfortunately there's a fault. In the meantime, you can stay connected with our Three inTouch app in the UK."
The 4G is not shown on the coverage map at all yet it just says coming soon, and the 3G still seems to be working fine, so if they hadn't said anything no-one would know anything is wrong.