Often it takes around 2-3 months for returned mail to be presented at our counter... quite remarkable really. A lot of the time our post just goes missing. There must be a black hole or something at the sorting office. I recently contacted Royal Mail after a rather important letter was kindly returned from someone with a kind heart - it had arrived through their letter box instead of the person I had intended. My main concern was that the mistake was really ridiculous where a letter intended for a London address ended up in Liverpool at an address that was in no way similar. I sent them all the required information as requested (original envelope with frank mark, address intended, place of posting etc) along with a quite indepth written document voicing my concerns over data security, blaming computers blah blah blah and after a few weeks wait finally received a reply advising me the "manager" of the complaints department had ensured she had notified the sorting office concerned to make sure this mistake wouldnt happen again. My points were completely dismissed... such a shame *sighs*