M40 To London - Where To Park The Car / Underground

[KTMsm]

My daughter (14) wants to see some of the sights, having had a quick look at the train options, I'd rather drive down

Where is the best option to then park the car and jump on a tube coming from the M40 ?

First stop is the War Museum

Thanks

[KTMsm]

Thanks gents

Westfield looked ideal but using City Mapper app I was shocked how long public transport took to cover the rest of the way

Google maps said driving was faster - so I booked a spot near the War Museum using My Parking Space £5.50 for a day's parking which was perfect