Ok the 56% wasn't greenflag my bad read the info wrong that was other smaller companies so apologies! Also yes GF do have their own vans...However
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Its actually 80% for greenflag same as RAC and AA, their response time (as per their website) is 40 minutes so also same as RAC and AA. They also use contractors same as AA and RAC for times when they are busy and cannot spare a patrol van so to stop customers waiting they send out a man from a local garage. RAC only used approved garages though not sure about AA or GF.
They still sell an insurance based product though, so depending on your history, your age, your car, the make and how old it is etc will vary your premium unlike AA or RAC who offer a flat-rate so even if you use all your callouts the cost is the same. Obviously can work better either way but if you have a flat battery a few times watch what happens to your premium
GF do not cover RTAs or own fault damage ie clipping the curb so you will have to fork out for that one, RAC will recover you for that though, as part of your policy
I think you'll also find there is a limit on their onward travel of about £100, whereas RAC or AA there isn't a cap on how far they will take you.
Oh and one more thing, according to their T&Cs they will start charging you labour after a 'reasonable time' at the roadside, wonder who decides that...