Johnston Motor Services Limited | Favorite About Johnston Motor Services Limited is a MOT Service Center in Johnston. Call us to book in for an MOT test or for more details. MOT ClassesClass 4 MOT TestPhotos Map No Records FoundSorry, no records were found. Please adjust your search criteria and try again. Google Map Not LoadedSorry, unable to load Google Maps API. Driving Walking Bicycling Public Transport Miles Kilometers Reviews Claim Listing Address Unit 17 Johnston Haverfordwest, SA62 3PA Contact Details Main Phone: 01437891496 Automotive Garage Category: MOT Test Station