I understood that Epsom was in Zone 9, but I went there recently and did enough trips that day to get a price cap, but despite that I only appear to have been charged for Zones 1-6 (£14.90, which is the same as I got for the following day when I stayed within Zones 1-6). Obviously I’m not complaining it I get charged less than I expected but I am curious to know why this is.
As an aside, does this mean you can also use a paper Zones 1-6 One Day Travelcard (or period Travelcard) to Epsom or does it have to be one that includes Zone 9?