GMG also signed a contract with Trinity Mirror -- the publisher of the Daily Mirror , Sunday Mirror , and Sunday People -- to outsource printing of The Guardian and The Observer .
The first tabloid format Observer will therefore appear on 21 January .
GMG also signed a contract with Trinity Mirror -- the publisher of the Daily Mirror , Sunday Mirror , and Sunday People -- to outsource printing of The Guardian and Observer   .
The first tabloid format Observer will therefore appear on 21 January .