Free Traffic Legal Advice

Hi I got a PCN for turning right where it's prohibited at the Lower Road Junction with Neptune Street. I don't think it was very clear, to be honest I see random PCNs like this as an expected consequence of driving in London! Anyway, I noticed a few other users have received the same PCN, and they also feel its not clearly signposted and there's been some advice around this already so I'm just wondering if anyone can help before I resign myself to paying yet another unfair charge.

The link below is to a scan of the PCN.

https://gbr01.safelinks.protection.outlook.com/ap/b-59584e83/?url=https%3A%2F%2F1drv.ms%2Fb%2Fc%2F4eff9fc8e72ac629%2FIQCy_aJBl0EYS74UsfDwXePYARcfhyC_TBeV0EGu3Bzxteg%3Fe%3D5bGyfL&data=05%7C02%7C%7Cd014c152e78a4ab26b0508de627e3c83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C639056491483559496%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=DqY56gD4lypDAQC84dTdHe9ISHdw8WiCtlxXFsCXom4%3D&reserved=0

Please post a GSV link to the location.

Incidentally, I was just looking for a somewhere to pull  over so I could look on google for an alternative route as sat nav was sending me down the Rotherhithe Tunnel and my van is too high for that, so I pulled in to Neptune street. I can't say I noticed any 'no right turn signs' they must be quite far before the turn- I could have missed them but when I have to drive through London I am always on high alert for this kind of thing.