Commons. For the subsequent by-election on 19 February, Yeo was selected as Liberal candidate and held the seat in a tight contest against the Conservative challenge, albeit by a small and much reduced majority. The Unionist candidate's performance was clearly given a boost by the Conservative victory in nearby Bethnal Green South West a by-election which had been caused by the resignation of Charles Masterman to become Chancellor of the Duchy of Lancaster and the result of which had declared the day before. A further reason for the small majority may have been what was reported to have been splits and disagreements in the local Liberal party with some elements having supported Sir Victor Horsley, the scientist and surgeon, as potential candidate over Yeo. 1918 There were boundary changes affecting Yeo's constituency for the 1918 general election and Yeo was chosen to fight the new seat of South Poplar. He contested the seat as a Coalition Liberal, having presumably been granted the Coalition coupon. He was opposed by Labour and by a candidate from the National Federation of Discharged and Demobilized Sailors and Soldiers, although this candidate, Captain Wilfrid Allen, is also described in other sources as a Conservative. Along with John Ward, Yeo was a vocal critic of the mui-tsai system, a form of Chinese child slavery then prevalent in colonial Hong Kong. Yeo held the seat with nearly 50% of the poll. At the 1922 general election, Yeo fought South Poplar as a National Liberal supporting outgoing prime minister David Lloyd George. In a straight fight with Labour's Samuel March however he lost the seat by the wide margin of 4,338 votes. 1923-28 Yeo tried to get back into Parliament at the 1923 general election when he stood for the reunified Liberal Party at the Northamptonshire seat of Kettering but he came bottom of the poll in a three-cornered contest. He did not stand for Parliament again but at the time of his death he was Liberal candidate for Romford in Essex. Other appointments Yeo took a strong interest in education being chairman for over 20 years under the auspices of the London School Board of local schools in St Leonard's Road, Hay Currie, and Bromley Hall Road Groups. He also served as Chairman of Lord Buxton’s Committee dealing with distress during the transport workers’ dispute of 1912 and as Chairman of the London County Council Mental Hospital