Here’s a report from Surbiton:
Traffic wishing to visit the postcodes KT6 4EB and KT6 4ED (nos 1- 69, Surbiton Court) are directed to enter the area via a (private) road off the Portsmouth Road – at the end of which they promptly get stuck – and lost!
To access the area without problems, traffic should be directed via St Andrews Square, using the same directions as for the postcode KT6 4EA.