I spoke a bit too soon, £1099 Cashback off the Hyundai Ioniq Hybrid is now available at Motorline Hyundai in Kent (Canterbury, Ashford & Maidstone), Gatwick, Hereford, Gloucester & Worcester.
https://www.motorline.co.uk/motability/hyundai/offers/ioniq/#form
Again until 30th September.
This may go Hyundai-wide – who knows?