Park this for use if it comes to an appeal.
Google Street View from Victoria Street, Stratford shows the flying motorcycle sign on the branch of West Ham Lane than runs along the side of the Old Town Hall. The sign in the Council evidence pack.
The flying motorcycle sign is facing Victoria Street. So it was facing away from where you parked.
That stretch of West Ham Lane is blocked at its entrance by three upright bollard pillars.
You entered from Broadway, where there is only a no through route sign. You couldn't have passed the flying motorcycle sign, even if you wanted to, as the route is blocked by the bollards.
The GSV shows the sign clearly. However the view of the bollards is obstructed by traffic at the lights. So try and get your own photo if it comes to an appeal.