The post boxes on Perry Vale (Bakers), Bampton Rd and Dacres Rd are all sealed. It says the nearest are in Silverdale or Woolstone Rd.
But no reason is given for the closures.

Maybe it is connected to the Olympics, but it would not surprise me if many post boxes are near empty at the best of times and their days are numbered.

Take note those on the wrong side of the tracks.
Your famous weekend leisure activity of all posting yourselves in the mail, maybe coming to an end.