When does the election to replace an individual who has been recalled take place?

BRIEFING PAPER, Number 5089, 14 October 2019, Recall elections, By Neil Johnston and Richard Kelly, accessed 26 January 2021

“If the 10% threshold is reached the petition officer informs the Speaker of the House of Commons that the recall petition has been successful. On the giving of that notice the seat becomes vacant. A by-election is then required and the recalled MP may stand as a candidate. The timing of a UK Parliamentary by-election is determined by custom of the House of Commons: the party that previously held the seat will usually decide when to trigger the by-election.”

Timeframe for when the subsequent elections takes place is not specified by the legislation. In the last two recalls conducted in 2019, the by-elections took place one month after the petition was successful.