<P> Oliver went on to share a kiss with Jac, a photograph of which was spread around the hospital by Penny, prompting Oliver to try and hide it from Daisha . Ward sister Frieda Petrenko developed a crush on him, and was pleased when he invited her for a drink, however Oliver did not reciprocate her feelings and later cancelled . Fedori commented in January 2011 that she and Anderson had had little "juicy" material, more "little scenes here and there". Asked about the future of Frieda and Oliver's relationship, she was unwilling to divulge potential plots, but noted, "There's been talk about things heading in all sorts of directions". </P> <P> Oliver initially had a "friendly rivalry" with sister Penny . Catherwood believes they always had "a really good relationship". She characterised the siblings' relationship as "one of constant rivalry but ultimately unconditional support", and noted, "Everything always comes more easily to Oliver than Penny--she has spent her life playing catch up". When Penny considered giving her career up over a patient she was romantically involved with, in order to protect her, Oliver ruined the romance . Their relationship remained unaffected by this: Catherwood revealed, "Well they are brother and sister, so you forgive your family for enormous amounts . So it doesn't affect their relationship, if anything he is there as soon as she breaks down he's there to catch her, full of apologies and support ." She said the situation would bring them closer together, because it is a typical scenario siblings go through . When Catherwood quit the series, Penny was killed whilst attempting to rescue a patient from a train crash . Her death was not shown on - screen: a conscious decision made by the production team to fully focus on Oliver's story . Series producer Myar Craig Brown revealed that the big focus would be on the effect it had on Oliver . Forced to come to terms with her death, he faced an "emotional rollercoaster of feeling that he was second best to her". </P> <P> Having arrived at Holby as an F1, Oliver quickly progressed onto his F2 training . This resulted in "professional jealousy" forming with Penny, and in retaliation to their disagreements, he put her career in jeopardy by revealing her affair . Registrar Greg Douglas was appointed as Oliver's mentor . The fast - paced storyline saw Greg initially "kick (ing) against his newfound responsibility", before realising that Oliver could be beneficial to his own career, which resulted in an "unlikely friendship" forming between them . Though a "fairly light, buddy - buddy" storyline to begin with, Anderson felt that filming their scenes was "intensive". Speaking of their friendship, Anderson explained: "We start off on the wrong foot with each other and we're competitive, which is unhelpful to the patients and (initially) we're not out to help one another at all . But they have similarities...in terms of dropping people in it ." The pace of the storyline had to be changed when Anderson injured his knee upon falling down a ten foot cellar . The pair clashed over conflicting medical opinions on patient care, and their friendship soon created a negative effect over Oliver's work ethic . Greg's jokes at his expense left Oliver unable to carry out simple procedures correctly . </P> <P> Oliver's career further deteriorated in early 2011, when it transpired he was not a qualified doctor . A series of setbacks--failing the exam to progress on to his CT1 training, blaming a surgical error on Penny, and the death of a patient in his care--prompted him to admit that he swapped his own exam paper with Penny's in his final year of medical school . Anderson explained that Oliver could no longer cope with the mounting pressure, hence his confession . Contrasting the siblings, he assessed "(Oliver) was seen as the golden boy when he arrived at Holby--but he was trading on his sister's success ." Issued with the ultimatum of confessing to Director of Surgery Henrik Hanssen, Oliver realised that "he must take responsibility", lest he "lose the one person who loves him unconditionally ." </P>

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