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The park & ride will be in North Weald or Hertfordshire University and I think you have to book. It's then a bit of a drive to the centre, there are residential streets opposite the entrance but I would imagine that some kind of enforcement will be put in place. If you can suffer the train it will be very simple, Liverpool St to Waltham Cross (about 30 mins, maybe less), then a very straightforward walk for 5 mins. There is a long stay car park in Waltham Abbey, then you will have a straightforward 5-10 min walk, but if it's a Tuesday forget it as it's market day and the car park will have lots of vans. When it becomes clearer about parking restrictions round here, I'll have a look and see where the best place for you to park will be.