Yes, mode 2 needs a type A RCD, the latest regs are here.
https://electrical.theiet.org/media/2422/bs-7671-2018_a1_2020-inc-corrigendum-may-2020_read-only.pdf
Mode 2 chargers have a control box fitted to the lead, but you’ll definitely want to put in some form of circuit protection, if in doubt I’d get the cars owner to get in a proper spark, you don’t want to get blamed for screwing their shiny beamer!
Previous Motability Cars
2006 - 2009 Skoda Superb VR6 2.0tdi
2009 - 2012 Citroen C5 2.0tdi VTR Nav
2012 - 2015 Nissan Qashqai 1.5dci tekna
2015 - 2018 Ford Kuga 2.0tdi Titanium X
2018 - 2021 BMW 220d X drive 2 Series Active Luxury
2021 - 2023 Hyundai Kona Electric Premium SE
2023 - Hyundai Kona Electric Ultimate