To quote the SMMT report:
Zero emission vehicle demand continues to grow, but industry calls for private motorist support as consumer uptake of battery electric cars declines
And
Electrified vehicle uptake continued to grow in the month, with plug-in hybrid vehicles (PHEVs) up 50.9% to take a 6.8% market share and hybrid electric vehicles (HEVs) up 30.7% to account for 13.9% of all registrations. Battery electric vehicles (BEVs), meanwhile, recorded their 41st consecutive month of growth – with 45,323 drivers making the switch, an 18.9% uplift. Given this growth was less than the overall recorded by the market, however, BEV market share slipped back slightly to 16.6% from 16.9% a year ago.