@oldnebraskan here you got:
Dear London Borough of Wandsworth,
I challenge liability for this PCN on the grounds outlined in the following tribunal cases:
LINK1
LINK2
In light of that the penalty charge must be cancelled.
Yours faithfully,
I will PM you some links to replace LINK1 and LINK2 above, those links will have a click counter that will allow us to determine if the council open them. If they don't, we have a failure to consider argument to deploy at the tribunal.
Make sure to send the representation online and keep a screenshot of the confirmation page.