Blundell left the series to become sporting director of MB Motorsport. Rob Collard left the series to drive in the British GT Championship. Rob Smith left the series after losing his drive at Excelr8 Motorsport to Chris Smiley. Matt Simpson left the series to support his son's karting career. Daniel Rowbottom left the series after losing his drive at Ciceley Motorsport to Jack Butel. Team changes Subaru will not enter a manufacturer team in the series after their four-year agreement with Team BMR ended at the end of the 2019 season. Team BMR would rebrand as BMR Engineering to design cars for other teams. BMR Engineering later entered a technical partnership with Laser Tools Racing, which allowed them to expand to a two-car entry for 2020. Excelr8 Motorsport switched from running the MG6 GT to the Hyundai i30 Fastback N Performance. BTC Racing will expand from a two-car entry to a three-car entry for 2020. Team HARD. switched from running one of their Volkswagen CCs to an ex-West Surrey Racing BMW 125i M Sport. AmDTuning.com became Mark Blundell Motorsport with Mark Blundell as sporting director. Motorbase Performance switched from running the third generation Ford Focus RS to the newer fourth generation Ford Focus ST. Changes related to the COVID-19 pandemic Power Maxed Racing originally intended to enter the 2020 season as a works team, fielding two Vauxhall Astra cars for Jason Plato and Mat Jackson, but elected to take a sabbatical from the series due to the pandemic with a view to return in 2021. The team would later make a return to the series as an independent team from Oulton Park onwards, fielding a single Astra for drivers on one-off basis. Andrew Jordan withdrew from the series following funding issues caused as a result of the COVID-19 pandemic. Team BMW elected to not seek a replacement driver, and effectively slimed down from running three cars to running only two. Mike Bushell initially signed with Team HARD, but later withdrew from the series initially due to health issues and later as a result of the COVID-19 pandemic. Bushell later returned at the rounds at Oulton Park and Knockhill for Power Maxed Racing and at Croft he replaced Tom Onslow-Cole in Team HARD. Howard Fuller, who competed sporadically for Team HARD in the 2012 and 2013 BTCC Seasons, was initially hired to stand in for Bushell but was replaced by Ollie