Most places which are 6 are likely to have access to a choice of car club vehicles.
Why would you spend over £2,000 a year (average car ownership costs are currently over £3,500/year, see link below, so £2,000 is quite a way below the average) for something that you probably aren't going to use all that often.
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www.nimblefins.co.uk
Someone with 2 kids who lived in Brighton never owned a car, used public transport for day to day. When they went to visit their parents would use a car club car for the weekend (using their own kids car seats), as they did that less than a dozen times a year.
Depends where, check out this map, it's surprising just how much the scores drop off:
tfl.gov.uk
For example whilst South Croydon Station is 5, not that far from it drops to 3 and not much further out dropping to 1b.