So, you drove straight past these two "Flying Motorbike" signs that mean No Entry for motor vehicles. Did you not know what they meant, because these signs are all over London now. Would you have gone past two No Entry signs ?
https://maps.app.goo.gl/uz7ZCAUWkmyvM5wbAGSV shows a central post, but I suspect this was soon removed to allow emergency vehicles through. Using satnavs in London is not recommended if it takes you through back streets as so many are now closed off in Low Traffic Neighbourhoods.
I do not see any credible appeal argument at the moment, others may do so.