In 1981, Hamer joined London Weekend Television's Big Match programme working alongside Brian Moore for over 10 years, continuing to do so, even after acquiring the National Sporting Club from Lord Forte in 1987 which was based in the Cafe Royal, Piccadilly, London W1 with former Corinthian-Casuals goalkeeping teammate, past England cricket Captain Bob Willis.
He became chairman of Swansea City in 1997, but was sacked in September 2000 after losing the support of the management team at the Club because of his erratic behaviour. He later attgempted to justify his removal by saying he did not agree with the club owners' decision to seek a flotation for the club on the Stock Exchange AIM market. Thereafter he vociferously campaigned against the club and its owners until he was paid a substantial sum in order to agree to desist from his actions. For the record Hamer had never been a shareholder in the club or in its parent company Silver Shield Group. Given the campaign mounted by Hamer which coincided with the decision of ITV to close its subsidiary ITV digital, thereby removing funding from the club, Silver Shield exited.. The Board of Silver Shield who had just sold their main business to Kwik Fit on attractive terms decided to abandon their investment in Swansea, aFter attemopts to find other investors locally and nationally, and they handed the Club over for £1 to its commercial manager, who in turn passed the Club over some months later when destitute to Tony Petty. This also coincided with Swansea Council's decision to award a contract for the new Morfa Stadium to a developer, Miller, on a contract which would not see the new stadium built for another seven years.
In 2002, he sold his interest in the National Sporting Club and worked as a consultant in football club brokerage alongside Keith Harris until his appointment as Chairman of Bristol Rovers in February 2016.[5]