My cousin in Southampton had a similarly terrible experience. After getting burglarized twice in one month and almost burning the entire house down with an accidental grease fire, she decided to bring in fire and security contractors to install fire alarms and intruder alarms. She’s also thinking about having a CCTV system installed in a few weeks.
I asked her and she says the contractors were from a company that provided fire and security systems in Portsmouth
. They apparently have been setting up security systems for both residential and commercial establishments since 1999, and have earned quite the glowing reputation amongst schools, offices, and shopping centers. Look up Key Systems UK Ltd; I think they also serve Winchester. Hope this helps!