GSM Security currently maintain and install the following systems: Access Control/Door Entry; Intruder Alarms; CCTV Surveillance; Automatic Gates/Shutters. Access and Door Control Systems allow secure access to doors/offices, only letting specific users access to a workplace.

Serviced Areas

  • London

Contact Details

  Website
  City Earlsfield
  Postcode SW18 4EF
  Address 20 Thornsett Road
  Phone Number 020 8374 7744

From Our Website

In 1926 William F. Banham and his wife, Marie-Ann, suffered a series of burglaries at their West London shop. Unable to obtain insurance unless the shop's door was bolted from the inside, necessity prompted William to invent the first ever automatic door bolt. Inspired to help others, William launched his groundbreaking design to the public, with huge success, and Banham Patent Locks was born. Still a family business, we're now the largest security provider in London and the southeast, drawing on our rich heritage to shape our future.


Providing a high quality, personal CCTV monitoring service, our in-house Alarm Receiving Centre operates 24/7, dedicated solely to Banham customers. Always fully-manned, our alarm controllers are ready to dispatch a Key Guard to your property in the case of an emergency or alarm activation. Banham's Alarm Receiving Centre operates 24 hours a day, 365 days a year. It can provide full reporting and a variety of levels of response to security threats, depending on your needs and insurance requirements.


Avoid locksmith scams by using a credible expert. Rogue locksmiths operating in London prey on the vulnerability of those who are locked out and charge extravagant prices. Certified by the MLA (Master Locksmiths Association), Banham emergency locksmiths are bonded and insured. They are also DBS (Disclosure and Barring Service) checked, so you can trust the locksmith entering your home. If you need to replace or change your door locks, Banham locksmiths can use their extensive experience and knowledge to make the best recommendations for you and your property.


Free call-outs for alarm activation and emergency lockouts for one-year when you sign up to our Standard Package. Please quote "KEYHOLDING20".* We provide a fast response whenever access to your home or business is required. Our secure in-house Keyholding team will look after a copy of your key and dispatch a Banham Key Guard to access your property when essential. From alarm activation response to daily routine visits and everything in between, we are on-call 24/7, 365 days. We offer different contracts to suit the requirements of any property, including an entry level Keyholding package, as well as various Keyholding and Alarm Response packages.


Come to your nearest Banham showroom to have your keys cut by a professional Banham locksmith. Keys that haven't been cut by a trained expert can leave dents, scores and imperfections in your locks, slowly undermining their integrity over time. Our expert services mean you can be confident that a trained professional will cut your keys to the highest possible standard. We can cut any key, including rare or unusual models, and we offer competitive price matching to ensure you're getting a fair deal.