I wish you hadn't paid the initial £60 as you've effectively admitted your "guilt" for want of a better word.
Not a problem though as a court would see that action as reasonable.
I've successfully fought 3 tickets now the last of which had a court date set.
The absolute first thing you have to do is not worry, honestly they have so much to do to win in court the odds are massively in your favour.
That's only if it gets that far and the vast majority won't.
You can ignore all the debt recovery stuff, it's standard generic toss, they're powerless. They cannot send the boys round to take your stuff, laugh at them and use letter to light a bbq.
As above, as and when you get a letter before action or letter before claim you absolutely must deal with it, you cannot ignore as it's a court document.
Also "court" in this instance is an office within the court building, it's absolutely nothing to fear.
Seriously you have the power here but you will have to arm yourself with knowledge.
Believe it or not, money saving expert forums have a parking ticket section and that's the place to go. The collective knowledge there is fearsome including retired solicitors that help.
Or here forums.pepipoo.com/ also lots of information.
I fucking hate these leeches, don't give them a penny more.
You can easily beat them, you've got this.
Good luck.