We strongly suggest that you use Char.gy TRUE PAYG as by registering and using your account with us then there is no upfront cost or pre-authorisation charge, you just pay for what you use. To set up an account with Char.gy follow the guide linked here.
Our current rates can be found here:
Using Apple / Google Pay with Char.gy automatically charges you the Pay as you go pre-authorisation charge of £40 and you will then be partially refunded after you finish your charge (so you'll only pay for what you use). More information can be found on this guide linked here.