The search term airport parking is triggering your ads, but has not been added as a keyword. The following (existing) keyword is responsible for this activity:
You spent £974.64 on the search term airport parking over the last 90 days. This search term generated a total of 842 clicks and 108 conversions at a CPA of £9.02.
This search term 63.6% cheaper than the average CPA of the parent campaign. Click Create Keyword to add this search term as a keyword. If the existing keyword +airport +parking already covers this traffic, feel free to dismiss this improvement.