Since many of the claims you see are raised simply to frighten people into paying, if the case goes to a hearing and you win, then you can get costs.
Often the parking company will not turn up and had no intention of turning up. In these cases, you can ask for additional costs above the Small Claims limit of £90 for "unreasonable behaviour". MIL Collection cases are particularly good in this respect.
General Form of Judgment or Order: Costs