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Burglar Alarms From £250.00. CCTV Systems, Intercoms, Security Systems Upgrades, Maintenance and Services Contracts From £60.00 Based in Watford Hertfordshire, TMS Alarms is an independent security company covering Hertfordshire, Middlesex and its surrounding areas. Because we are engineering led rather than a sales driven company, we can offer our customers affordable quality and excellent service. www.tmsalarms.co.uk .