PAT Testing St. Albans - Fast Service - Experienced Portable Appliance Testing in Hertfordshire -Professional and Trusted PAT Engineers - Low Price, efficient and fast service for Businesses, Landlords and property Owners. Call 01727-309677 - PAT Safety Welcome to PAT Testing Hertfordshire. we provide portable appliance testing to enable businesses, landlords and property owners to comply with the Electricity at Work and insurance Regulations. Based in St. Albans, we cover Hertfordshire, London and surrounding counties. If your company requires PAT Testing in the Hertfordshire, Watford, Luton, and Hemel, please feel free to call us or fill out the contact form below if you would like a chat or a visit to discuss your PAT testing requirements 01727 309677. PAT Testing companies.