It is funny that you mentioned Lexus Woodford in relation to your service/oil change.
I contacted them for a yearly service on my RX450H and the price was over £100 dearer that the dealer whom i purchased the car from.
So I took the vehicle back to Lexus Sidcup, I know that it is a way from my home but it was worth it, great service and customer focused.
I mentioned this to Lexus Sidcup and they said that the servicing should be the same price.
Interesting!!!