I don't think anybody has seen one of these before, because Wandsworth are enforcing parking on-street under the Traffic Management Act 2004, but this is an off-street allegation. So I and others will now have to look at the Act this notice is issued under, the London Local Authorities Act 2004.
As this is not a Penalty Charge Notice under the TMA 2004, none of what you have written applies. If you fail to pay, as I understand it, the next stage is the magistrates court, but wait until people have actually read the Act.
I'm going to request that this thread be moved to the criminal and private tickets form, because this forum is only for PCNs served under the various Acts which give decriminalised powers to councils to serve and enforce Penalty Charge Notices. Yours is a Fixed Penalty Notice under Clause 15 of the LLA Act 2004. The list of offences shows that No 17 would seem to apply to your FPN.