In his short tenure from 2000 to 2002, the FA relocated headquarters from Lancaster Gate to Soho Square, appointed the first ever foreign England national team manager, Swede Sven-Göran Eriksson, and became a more commercial organisation, maximising its revenues.

While at the FA, Crozier reportedly identified some members of the England national team as the Golden Generation.

[10] It was a term later criticised towards the end of the decade by some England players as having been undeserved, and of causing undue expectations and pressure due to the fact they had at the time, and in years since, failed to win major tournaments.

[13] The newly formed mail regulator Postwatch were however critical that it had failed to achieve 11 of its 15 licence targets during the previous financial year.

[13][14][15] Ongoing reforms eventually led to large scale industrial disputes and strike action in both 2007 and 2009 onwards.

Prosecutions were conducted based on revenue shortfalls identified by the Post Office's Horizon computer system.

[17][18] In May 2024, the Financial Times reported that Crozier had received letters from at least four Members of Parliament about problems with the Horizon system, and their consequences for sub-postmasters, while he was at the Royal Mail.

[21] Crozier was given the task of increasing ITV's advertising revenues which had fallen with the proliferation of new channels in the British television market.

[21] On announcing the appointment, ITV chairman Archie Norman said of Crozier that he is a "very strong leader with a great track record in delivering transformational change".

[21] In ITV's 2023-4 docu-drama Mr Bates vs The Post Office, ITV failed to make mention of the role of Crozier in the unfolding seven years of the British Post Office scandal, prior to the reins being handed over in 2010 to his successor CEO Paula Vennells.

[22] At the time Crozier was Royal Mail CEO, the Post Office was, in effect, a division thereof.

[22][23] Crozier was also a board member of Camelot Group, the former operator of the UK National Lottery, and the Debenhams retail chain, before it was liquidated.