Forster was involved in civic affairs by 1377. As Commons’ bailiff in 1384 he informed the sheriff of Hampshire of the result of the Winchester parliamentary elections, and in 1386-7 he was one of four auditors of the 24 and a cofferer.
Although his second wife stood to inherit lands in Sussex, these never came into Forster’s possession, and his interests remained centred on Winchester. Here he was also a feoffee of various properties, including La Starre Inn; and in 1405 during his second mayoralty he was appointed trustee for the administration of the chantry founded under the will of Lucy, widow of Richard Frye. In 1407, along with Edmund Picard, he rode to Andover on the city’s business.
