I think you might nit be able to recover the cost if fitting a charger by a local company, as Motability have not authorised it.
Maybe not but, £600 for a charger and installation is a no brainer when the op is being charged £2k for installation only via Motability.
It’s worse than that, it’s £2k charge for me for the additional work and then the cost they charge Motability
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