Draft representation:
Dear London Borough of Newham,
I challenge liability for the PCN because the alleged contravention did not occur. The signs indicate that blue badge holders are permitted to enter the zone, a blue badge was displayed at all times and it is registered to be used with the vehicle also.
It follows that the contravention did not occur and the PCN must be cancelled.
I enclose a copy of the blue badge for your records.
Yours faithfully,
Send this via the council website, you'll have to do it separately for each PCN. Make sure to keep a screenshot of the confirmation screen.