I've used Jayserv since they began, where they have serviced and upgraded the numerous heating systems in the largest school in Croydon. We also used them for water testing and electrical works. Since I have moved to a new company I've also used Jayserv extensively with another heating system replacement, servicing, building works and for upgrades on our complicated electrical system. The team have not let us down and have gone the extra mile time and again to make sure that our site hasn't lost power during these works. Being a security company, we cannot have any mistakes. Highly recommended.