Update time!
I've just tested the EE coverage along the A11 towards Thetford, which is/has always been a weak spot for EE 3G2100. Last year the signal was very unreliable. Nowadays things seem better.
However, there is still one serious weak spot in the forest area. Surprisingly, it said no signal where there was a nearby mast with new panels!
Something that I'd like Bookey UK to check (if it's possible, also if you'd prefer, PM me the answer) : is o e of the masts on the A11 between the A14/Mildenhall roundabout, and Thetford, now 2g/4g only? As I quickly flicked my phone to lte mode and a 4g signal was present.
Also if it is the case that the mast is 2g4g, will 3g ever be added?
Edit, other side of Thetford signal is weak too.
Edit 2: if anyone knows that area, or wants to go on Google Maps to find it (I can't as on mobile), it's the mast closest to the monument that is by the road side, on the A11.