Could be any number of things. Might be that someone knocked the wires whilst doing work in the cab and have partially reconnected your neighbours but not yours. Could be in the same bundle and connection has somehow got loose and your neighbours making a partial link but your not. Could be coincidence (although sounds unlikely).
Having made further enquiries apparently this is not a unique occurrence, chappie down the road. on more than one occasion has his phone cut off but Bt BB reconnected. However, all is now up and running again, thanks all for your responses.