I have left foot accelerator adaptation fitted to my car.
Best advice is to do a google search or contact your local authority to see if there is a mobility centre in your area.
At a mobility centre they will asses your ability with different types of control adaptations to find which is best for you, (ie try before you buy).
I found that the left foot operation, was very easy to use.
When the adaptation is fitted to your car, the mobility centre will arrange for you to have a driving assessment using the adaptation , this is a requirement of the DVLA. Don’t concern yourself about the driving assessment, it is not a driving test, it is just to ensure you have full control of the vehicle.
The assessor is there to help you, not to stop you driving.
My adaptation cost approx £350.00.
Don’t forget to advise your insurance company, they will need to add this to your policy, they are not permitted to charge you for this or load your premium in any way.
Hope this is of help.
I. El. (Eng). (Rtd).