Scott Arthur's rise was built in Edinburgh's municipal politics rather than Westminster's factional networks. Elected to the city council in 2017, he became transport and environment convener under Labour's minority administration in 2022. That put him in charge of some of the capital's most contentious policies, from parking enforcement to restrictions on polluting vehicles.

In July 2024, amid Labour's Scottish recovery and the SNP's wider collapse, he defeated the prominent nationalist Joanna Cherry in Edinburgh South West. Arthur secured 40.9 per cent of the vote and a majority of 6,217. It was a significant victory, although the national swing did much of the work.

Arthur is recognisably a municipal social democrat. His politics emphasises public transport, cleaner air, safer streets and the capacity of government to improve everyday surroundings. He is comfortable with regulation when it serves those purposes, even when motorists object. The strongest expression of that approach came with Edinburgh's low-emission zone. Although the scheme was formally introduced before he became convener, Arthur oversaw the preparations for enforcement, which began in June 2024.

The early evidence suggests the zone altered behaviour. More than 95 per cent of vehicles entering it were compliant after its first year, while penalty notices fell by 56 per cent between June 2024 and January 2025. Researchers also found a small but statistically significant movement towards public transport and active travel. These figures do not yet prove how much air quality improved, and the council acknowledged that fuller environmental modelling was still required, but they show that compliance rose and travel patterns began to change.

His administration of the policy was not flawless. Arthur had declared that every council vehicle would be compliant by the time enforcement started. In fact, 41 were not. The authority had to hire 38 replacement vehicles for an initial £28,770, roughly £2,000 a day, despite a substantial fleet-replacement budget. It was a damaging example of the council imposing a standard it had failed to meet itself, and of Arthur making a categorical promise before the underlying work was complete.

He also implemented Edinburgh's pavement-parking prohibition once Scottish regulations allowed councils to act. Enforcement began in January 2024 after officers examined more than 5,000 roads. The measure, carrying a £100 penalty, prioritised wheelchair users, visually impaired pedestrians and parents with pushchairs. Arthur deserves credit for choosing city-wide enforcement without exemptions, though not for creating the legal power, which came from the Scottish Parliament's Transport Act. The distinction captures his council record: he was more often an energetic implementer of available powers than the originator of them.

His most substantial achievement came surprisingly quickly at Westminster. Having secured sixth place in the private members' bill ballot, Arthur introduced legislation intended to correct the neglect of rare cancers. Working with patient organisations, medical charities, ministers and parliamentarians from other parties, he steered the measure through both Houses. It received Royal Assent in March 2026 as the Rare Cancers Act.

The Act requires stronger attention to research, treatment development and clinical-trial participation for cancers affecting no more than one person in 2,000. It also provides for better use of NHS data to identify potential trial participants. That is genuine legislative delivery, especially for a first-term backbencher: fewer than five per cent of private members' bills introduced between 2010 and 2024 became law. Its eventual value will depend on implementation, funding and the response of researchers and industry, so Arthur cannot yet claim improved survival rates. He can claim to have created the machinery intended to produce them.

His constituency work has been practical too. After serious firework disorder in 2024, his office persuaded all the major supermarkets in Edinburgh South West to stop selling fireworks locally. This was a limited, voluntary intervention rather than national reform, but it showed an ability to convene businesses around a visible community problem. He subsequently pressed for wider controls in Parliament.

Arthur's larger Edinburgh ambitions were less complete. Plans for a north-south tram extension remained at consultation and financing stages, with no constructed line to show for his advocacy. His council tenure therefore combined determined execution with some over-promising and a tendency to identify progress with plans still far from delivery.

Overall, Arthur appears capable, interventionist and unusually productive for a new MP. He has shown that he can administer politically difficult measures, build cross-party and charitable coalitions, and turn one such alliance into statute. The council fleet failure cautions against accepting his assurances too readily, while the unfinished tram programme shows the limits of municipal ambition without money. Nevertheless, the Rare Cancers Act gives him a concrete national achievement that many longer-serving backbenchers never acquire.