The seat had become vacant on 6 March 1945 when the National Liberal Member of Parliament (MP) George Morrison had resigned by the procedural device of accepting the post of Crown Steward and Bailiff of the Manor of Northstead, a notional 'office of profit under the crown' which is used as a procedural device to enable MPs to resign from the Commons.
On 1 June 1940, Mason resigned his seat by accepting the stewardship of the Manor of Northstead.
However, he resigned his seat four weeks later, on 20 March, (by taking the Stewardship of the Manor of Northstead) to make way for the former Solicitor General Sir Frank Soskice, whose Birkenhead East constituency had been abolished.
Taverne's appointment as Steward of the Manor of Northstead did not take effect until 16 October.
The Manor of Northstead was a medieval manor house surrounded by fields and farms in the parish of Scalby in the North Riding of Yorkshire in England.
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