Nadia Sawalha, Midge Ure, Craig Revel Horwood, Jeremy Edwards, Chris Bisson, Martin Hancock, Sunetra Sarker, Gemma Atkinson, Sherrie Hewson, Pauline Quirke, Rani Price, Chris Hollins, Matthew Wright, Angela Rippon, Sue Cook, Lorne Spicer, Emma Forbes, Jeff Green, Darren Bennett, Sally Gunnell, Mark Foster, Matt James, Robbie Earle and Phil Tufnell.
Sue Cook, Jeff Green and Nadia Sawalha take on two tests for a place in the quarter-final, by cooking for the judges and for paying restaurant customers at The Rib Room.
Matthew Wright, Lorne Spicer and Jeremy Edwards take on two tests for a place in the quarter-final, by cooking for the judges and for paying restaurant customers at Odette's.
Angela Rippon, Christopher Bisson and Darren Bennett take on two tests for a place in the quarter-final, by cooking for the judges and for paying restaurant customers at Theo Randall at The Intercontinental.
The four winning chefs from the heats battle it out for two semi-final places.
Chris Hollins, Matt James and Pauline Quirke take on two tests for a place in the quarter-final, by cooking for the judges and for paying restaurant customers at Villandry.
Craig Revel Horwood, Rani Price and Phil Tufnell take on two tests for a place in the quarter-final, by cooking for the judges and for paying restaurant customers at Aurora.
Robbie Earle, Gemma Atkinson and Midge Ure take on two tests for a place in the quarter-final, by cooking for the judges and for paying restaurant customers at Babylon Restaurant at Roof Gardens.
Sunetra Sarker, Mark Foster and Sherrie Hewson take on two tests for a place in the quarter-final, by cooking for the judges and for paying restaurant customers at Bonds at Threadneedles Hotel.
The four winning chefs from the heats battle it out for two semi-final places.
In the first of the semi-finals, the four best celebrity cooks cater for a group of hungry young army cadets.
The four semi-finalists have to cook a two-course meal for three of the country's most respected restaurant critics, Charles Campion, Kate Spicer, and Jay Rayner. Tension and emotions run high as one of the contestants is sent home.
The three finalists must cook a three-course meal at The Square Restaurant for chefs including Michel Roux Jnr and Angela Hartnett.
The three finalists are sent to some of London's best restaurants to fine-tune their individual cooking styles, before coming back to the studio to show the judges exactly what they've learnt.
The three finalists have to cook their best three-course meal for one last judgement from John and Gregg, as one of them is crowned Celebrity Masterchef Champion.