If you don't pay a parking ticket you won't get a bailiff turn up without warning. First a court order has been issued. You will get a letter asking you to pay the ticket plus court costs or make a declaration to say you didn't get the ticket or notice. If you make the declaration, then the ticket amount goes back to the original amount and you get a chance to pay it or appeal and have the record wiped.
If you lie about not getting the ticket though, you could get 2 years for perjury. Plus you have to sign in front of a lawyer etc, which will probably cost more than the ticket.
You won't suddenly get a bailiff without first ignoring letters from either the court of parking enforcement.
It depends on the council byelaws for parking on the grass verge, but if there are double yellows, they normally apply to verge, pavement and carriageway.
I would just pay to be honest, especially if you haven't registered the car in your name as this is an offence as well.