[4] After a few stints working at City Limits and IPC Magazines (TVTimes and What's on TV),[5] Preston relocated to Australia in October 1993.

He subsequently wrote for a number of Australian trade publications owned by IPC's parent company, Reed Business Publishing including Encore, Supermarket News and Counterpoint.

Preston also worked as a regular food correspondent in a number of publications, including Taste, a supplement in the Herald Sun, The Courier-Mail and The Daily Telegraph (Australia) newspapers and MasterChef Magazine, delicious.

(Senior Editor), Australian Good Taste as the drink reviewer, The Guardian newspaper (UK) and Time Out (London).

[11] In 2019, it was announced Preston, Mehigan and Calombaris would all be leaving the show after eleven years of judging, when Network 10 failed to meet pay rise demands set by the trio.

[15] It was later announced that chef and former MasterChef winner Andy Allen, food writer and critic Melissa Leong and chef and restaurateur Jock Zonfrillo would join the series as judges and hosts for the twelfth season in 2020 as replacements for Preston, Calombaris and Mehigan.

[16][17] Preston has also made numerous other appearances on TV shows including multiple appearances on The Project, Good News Week, Studio 10, The Living Room, The Circle, Rove Live, This Week Live, All Star Family Feud and Chris & Julia's Sunday Night Takeaway (all Network 10), ADbc and The Blue List (SBS), Compass (ABC), Today and Postcards (both Nine Network) and Coxy's Big Break (Seven Network).

Preston and international food icon Nigella Lawson were brought in to replace previous judge Pete Evans, who was sacked from the show because of controversial comments he made.

[27][28] In May 2023, he was announced as one of the celebrity contestants competing on the twentieth season of Dancing with the Stars Australia, and was partnered with Jessica Raffa.

[29][30] However, on 2 July 2023, on the third episode, he withdrew from the series after sustaining an ankle injury during dancing rehearsals, making him the first contestant to leave the competition.