A 22kW charger is 3 times faster than a 7kW charger but requires a three-phase electrical setup. Most UK residential properties run on single-phase electricity so cannot have a 22kW charger installed. Single phase supports a maximum of 7kW EV charging.
Also, it’s worth checking that your EV can support 22kW AC charging. Many vehicles only support higher charge rates when using Commercial DC rapid chargers.