[1] Sills grew up in Launceston in Cornwall, and learnt to sail on beaches and lakes in South West England.
[3] He has younger identical twin sisters, Imogen and Saskia, who are also professional windsurfers.
[6] He returned to competitive sailing in 2020, after it was announced that IQFoil would feature in the 2024 Summer Olympics.
[7] Having lived in a van for a year in order to afford sailing equipment, he finished seventh in the World Championships that year, and went on to be the leading British rider in the European Championships.
He qualified from the preliminary race in eighth position,[8] and finished as runner-up in the quarter-final,[9] however failed to advance through the semi-final.