Yes
Always ignore debt collectors.
APCOA don’t “do” court. If they change their modus operandi, wait for a Letter of Claim and, in the meantime, search the forum for
APCOA Luton
to see the appeal you could have submitted originally and will still form the basis of a defence if necessary.
You can safely ignore any debt recovery letters from vermin like DRP+. They are powerless to do anything except to scare the low-hanging fruit on the gullible tree into paying out of ignorance and fear.
APCOA is likely trying to hoover up unpaid notices from its back catalogue by engaging the likes of TRACE, who will get a percentage of any money they extract from you as their fee.