A lot of those 'EV' tariffs are rubbish and will actually cost you more. Do a little research before you commit.
My spreadsheet may be a little of out date (not by much) but will allow you to easily spot the expensive tariffs and by playing around with your expected consumption you should be able to identify a tariff that fits with your needs.
Clearly your meter may not be smart enough to get the very best tariff but then there are standard tariffs out there that easily beat some of the smart 'EV' tariffs while you wait for your meter upgrade.
brilliant this, thanks