I have been in contact with O2 via their Facebook site messaging service https://www.facebook.com/o2uk/ regarding our failed mobile signal, and they have escalated my complaint.
The social media site is the best way to contact O2 (for anything); it appears to be staffed by English people and they reply promptly. Phoning O2 is hopeless…
How long has the service been unavailable? I think at least since the 8th August.
There has been no activity at the mobile mast site at Brook Close Farm.
I suggest as many people as possible complain to O2 via Facebook to try and get them to do something. I had a message saying that they had planned work to be done on the 13th and service would be restored by that evening…
UPDATED: 19/08 4pm
I have just had a further update from O2 – for the blog-
“Our engineers have identified a fault on the mast and have ordered the parts”
Martin C
PARWICH.ORG 
I sent a complaint via email to
complaintreviewservice@o2.com
on Friday last week regarding the lack of signal. Today O2 complaints team phoned me to discuss the complaint, work is ongoing , parts have been ordered but I was told that service may not resume until 29 August , they have credited my account with this months rental.
i have also complained