We are a small family run business operating around all of Hertfordshire and North London. We have been established for over 14 years and pride ourselves on a quick "non-corporate" style service. We can normally be at your door with in an hour of calling us and carry a wide range of products, in our fully equiped vans. Areas serviced: Welwyn, St Albans & Potters Barwww.abclocks.co.ukSecurity House/Tilsworth Walk, AL4 9JT

Independently-owned; accredited by SSAIB and UKAS; trusted by hundreds of residential, business and major public sector customers including hospitals, schools and police forces. Amthal Security designs and installs tailored, modern and effective electronic security systems, based on the latest technology, with the most reliable, comprehensive monitoring facilities, all backed by our specialist service team. Areas serviced: Welwyn, St Albans & Potters Barwww.amthalsecurity.co.ukUnit 4G/Beaumont House/Sutton Rd, AL1 5HH

National Lock & Safe is one of the UK's leading Locksmith Services working around the clock, 365 days of the year, anywhere in the UK. As well as Locksmith Services we also provide repairs and installation of Safes, Roller Shutters, Access Control Systems, Door Entry Systems and Security Grilles. We are extremely competitive with fixed rates. We do not charge for travel or mileage. You only pay for our time on site. Areas serviced: Welwyn, St Albans & Potters Barwww.jemsecurity.co.ukUnit 18/Smug Oak Green Business Centre/Lye La Bricket Wood, AL2 3UG

Unlike most other security companies, we only specialise in visual and audio surveillance. All our systems are personally custom designed, as in this niche industry it is essential to design a system which fits the environment or situation in which the application is to take place. AVS is designing cctv systems for the smallest retail outlet to the largest industrial complex. Areas serviced: Welwyn, St Albans & Potters Barwww.cctvuk.netTollgate Farm/Tollgate Rd Colney Heath, AL4 0NY

Abbey Locks and Security is an established 24 hour police recognised Locksmith and Security company operating throughout London and the Home Counties. Our trained engineers can be on site within 1 hour of your call day or night. We employ a fully qualified skilled team of engineers throughout Greater London who can attend your premises and advice you on security and what will best suit your property. Areas serviced: Enfield, Welwyn, St Albans & Potters Barwww.abbeylocks.co.uk19 Wyedale London Colney, AL2 1TG