Check the phone masts etc. here.
The EE one https://www.openstreetmap.org/node/10085838209 still exists.
There's one by the "communications_transponder" https://www.openstreetmap.org/node/5587204812 .
I don't believe that there is an O2 one by the new car park https://www.openstreetmap.org/node/10085838208 .  
Has the O2 one moved north, and is the "communications_transponder" something different?