It might be worth contacting Redbridge about the missing PCN, and aks they cancel the CC and send you a copy of the PCN.
Your backstop if this fails, is to wait for the Order for Recovery, (adds £10 to the CC amount), and then submit a Statutory Declaration to the Traffic Enforcement Centre, that you didn't receive the PCN. TEC will cancel the OfR, and CC, and revert the matter to the PCN stage, (the council must send you a copy), that you can then pay or submit representations.
PS: Why are you prepared to fold without submitting any reps ? These new restrictions may not be as well signed as you think.