Free Traffic Legal Advice

You have to suspect you are in a controlled parking zone if a single yellow has no sign.

What was your route top where you parked?

Please advise what else I should use to access the PCN?

Sorry - route to where you parked. I can't find a decent CPZ map. You will have passed zone entry sign(s).

Controlled parking zones need only zone entry signs.

If you give me the exact route - the roads you used-  I can check if the signage is reasonable. 

As you are leaving the bridge, and before passing under the 'tunnel', there are these signs: -
https://maps.app.goo.gl/X8zNRyQFDHHrkQH99.

Miles away from where you parked, of course. This is very naughty of KuT council, because a CPZ is not recommended for more than a few streets, but they get away with it, I'm afraid. They should at least put up some repeater signs like Coventry have done for instance. (Centre of Coventry is one vast zone within the ring road). Basically, in the London area, if something looks too good to be true, then it is too good to be true.

Here is their website page where you can type in a street and it'll give you the zone you are in: -
https://www.kingston.gov.uk/parking/parking-zones?search_api_fulltext=the+bittoms

You were parked in Zone A and A1, Kingston Town Centre. Does the response also tell you the restricted times ? Of course not, that would make it too easy wouldn't it !

If it were me I'd submit reps on the basis of totally inadequate signage, and point out the vast size of the CPZ which is totally against all guidance. The distance from the signs on the bridge to The Bittoms where you parked is nearly 1.35 miles ! Of course they'll reject them, but at least they'll have to do at least some work for their money. I don't think this is worth a trip to London Tribunals unless somebody on here can come up with a 'technical' appeal, based on their mismanagement of the enforcement process. These can win on their own, and have done quite a few times.