I'm not sure which account to go for?

beckforddd

I'm almost 18 years old, and a lot of my Children's savings bonds are maturing, and I would like to claim them to put into an account to save up for a car/driving lessons. However I'm not sure what account to go for. I know you need to deposit a minimum amount either each month or each time you deposit, but I won't be depositing around £500 each time, it'll be more like £30-£100 as my bonds mature.
I don't want to put my bonds into my personal bank account as I'm wary of spending them, therefore I wanted to save them, but also to be able to withdraw cash at any time. Is it worth me looking into ISA's, or a basic bank account? Please help!