Cuvva. It's a app on your phone, put all your details in and driving license number.
Home page is then a blank reg that you fill in and it will give you an instant price from 1 hours cover to 2 months I think.
Once your details are in, From putting the reg in to being fully insured takes 2-3 mins. I've used it twice now.
Last time was on a transit crew cab van for 3 days cost me £34