I was an existing customer
Bought a new Nissan Leaf (electric) car and wanted to switch my cover from previous car.
comparethemarket.com Saga = £356 (the top ten companies were all about the same price).
Called to arrange it:
Told 'Oh your underwriter doesn't cover electric vehicles, but the underwriters will cover it for £669.55
Went to M & S slightly better cover with the extras £375