Permanent parking space in the outskirts of London

Hey!

My friend and I want to go to London and we‘re traveling by car from France. It’s the first time I will drive in left-hand traffic and don’t want to drive in London city with a car made for right-hand traffic and zero experience

So I thought about parking the car somewhere in the outskirts.

My question is if you know a parking space where I can park my car for multiple days? It would be around 5-6 days I found a few park&ride parking but it seems to be just available for a day

Thank you so much!