Guardian issues correction but no apology

From the The Guardian by its Corrections Editor, 25 June 2009:

In a report, The £7,000 roofing bill two days before Blair left office, we said that Tony Blair declined a peerage on stepping down as prime minister and as an MP in 2007 partly to protect his post-Downing Street finances from scrutiny. This was untrue. Peerages have customarily been offered to prime ministers on leaving the House of Commons, but Tony Blair's office has informed us that having neither sought nor been offered a peerage, he has not declined one to protect his finances from scrutiny (19 June, page 4)

Note that the correction contains no word of apology and fails explain that the roofing bill was for work carried out several months before.