This one is from a former poster and did always say never pay ECP a penny.
If out of the 28 days, this is their requirement.
You could still send and it shows that you are trying to resolve this and not ignoring it.
And it creates a paper trail.
"ECP NTK and Signage by b789
Is PoFA paragraph 9(2)(e)(i) complied with? Does the NtK specifically invite the Keeper to pay the charge? As far as I can see, it only mentions that the driver must pay.
Also, check out the PPSCoP. In big bold writing on the front of the NtK it says that payment is to be made within 28 days of issue. Section 8.1.2(e) of the PPSCoP says that the recipient of a notice has 28 days from the date of receipt, not date of issue.
ECP signs are never PoFA compliant with paragraph 2(2) or 2(3) as they do not adequately bring the charge to the attention of the driver. Do a search for examples of the sign in the Beavis case and the ECP sign and you will see the difference in how the £100 chargers is presented.
Also, put ECP to strict proof that they have a valid contract flowing from the landowner that permits them to issue PCNs at the location."