|Portrayed by||Owen Brenman|
|First appearance||14 October 2008|
|Introduced by||Peter Eryl Lloyd|
Heston originally trained to be an Orthopaedic Surgeon and worked in the NHS for years. He wasn't that popular with staff, especially Vivien March, the former matron on his Orthopaedic ward. Heston decided to work as a GP following a heart attack which made him re-assess his future.
Heston is first mentioned when Julia Parsons and George Woodson are discussing who she is interviewing for Joe Fenton's job. Heston's interview did not get off to a good start, as he assumed Julia to be a receptionist. Heston managed to get the job by taking Julia to the Icon Bar for lunch where he convinced her that he was right for the job. Julia has since had second thoughts due to Heston's unconventional approach to patient care and the ruffled feathers amongst the other staff. However, it seems Heston is to be a permanent fixture as he has been offered a partnership. Heston has taken on the role of mentoring new GP Registrar, Simon Bond. From the very beginning of Lily Hassan's arrival at The Mill, it is clear Heston is in love with her. Despite her constant rejection, he perseveres and it is made clear at the start of 2009 that she has feelings for him also. After helping Lionel and Vivien reunite, Lily kisses Heston and a relationship ensues. At the Mill's Christmas Party in 2009, Lily proposed to Heston but he rejected it.
In early 2009 after working very hard as a doctor and a partner Heston suffered a minor heart attack. Lily helped and supported Heston through this, and he later recovered and returned to his usual self. Heston made a shocking revelation during an assertiveness class he attended with Ruth. After going too far in a role play, Ruth says it was a blessing that he had never had children to which Heston said that he was a father - once. At the beginning of October 2009, Heston's wife, Christine O'Connell played by Christine Kavanagh, and mother of his recently announced child, Steven O'Connell played by Theo Cowan, re-appeared in his life and he was determined to make sure that she didn't make his life a misery once again.
On 5 January, Heston's friend Charlie Bradfield arrives after Jimmi gets kidnapped and Charlie does Jimmi's work for him. He supported Charlie when he causes them both to get kicked out of an Indian restaurant where Charlie is accused of molesting the restaurant manager's wife.
During the later part of 2011 to the beginning of 2012 Heston began dating Marina Bonnaire. At first he saw see her charming side, but later into the relationship he saw another side to her; she would become erratic and violent towards him, even at the slightest thing (like if he missed a meal and was late home). One day Heston decided enough was enough; after dealing with a patient's case that he felt particularly passionate about, he asked Marina to leave. She packed her bags and headed off to her son Ian's house in the hope he'd take her in. The next day Heston lied to his colleagues about the situation regarding Marina's departure, saying it was in fact she who initiated the split.
Heston was a victim of a burglary, finding his home trashed and robbed. His colleagues help him to tidy up, but Heston can not fathom or cope with what has happened. He begins to replace his possessions- with the help of Dr. Kevin Tyler - but subsequently discovers his insurance was invalid, and they will not pay out for his losses. He begins to sleep with a cricket bat beside his bed, in fear that the robber will return. When his robber returns one night, Heston confronts him in his kitchen, but is threatened with a screwdriver by the robber - Curtis- who begins to leave with Heston's belongings. Heston flies into a rage and follows Curtis to the driveway and hits him with the cricket bat 3 times, rendering Curtis unconscious and bleeding from a head wound. A neighbour witnesses this after hearing the commotion, and calls the Police. Heston is arrested and taken to Letherbridge police station, where he lies in his preliminary interview with PC Cook (the arresting officer) and behaves in a pompous and arrogant manner, stating he is the victim and has the right to protect his home. When he is informed that only reasonable force can be used, Heston states that he only hit Curtis once and PC Cook does not believe him. Rob Hollins is shocked to find Heston in the cells, and also what he hears Heston has said- Heston had refused legal advice, which Rob tells him is a bad decision. Heston admits to Rob that he has lied about the number of times he hit Curtis. In his second interview, PC Cook informs Heston that medical evidence suggests that Curtis has been hit more than once and that he is in surgery with bad injuries. Heston admits he may have hit Curtis more than once, and asks for a lawyer one PC Cook informs him that he will be charged with attempted murder. The Crown Prosecution Service later charges Heston, much to his shock and dismay. He had been sure that he would not be charged, and seems reluctant to accept the severity of his part in the event. All of Heston's colleagues are shocked to learn of what happened, and Cherry and Mrs. Tembe are devastated. But when Mrs. Tembe participates in some voluntary hospital work, she encounters Curtis and pleads with him to drop the charges. Curtis, however, complains about her action to the police- and Rob informs Mrs. Tembe that she cannot interfere with the case and it may damage Heston's chances in court. She is horrified. Further still, when a video of the attack appears on the internet showing Heston hitting Curtis — seemingly unarmed — his colleagues worry about what Heston will be facing at court.
In 2014, Heston begins psychological therapy after experiencing hallucinations, sleepwalking and amnesiac episodes which his doctor believes may be caused by depression.