Hi there!
The main reason for an increase in prices is that as of 6th April 2022 the government's Benefit-in-Kind tax rose from 1% to 2%. The good news is that the rate is fixed at this level for the next three years. The other reason is that some car manufacturers have increased their prices in response to increased costs of raw materials as well as the current high demand / low supply dynamic. Hopefully the great savings available via salary sacrifice make up for this in the short-term, and over the longer term we expect the prices of electric cars to come down.