We've used TFS over the last few years, first making contact with them when we noticed a water-leak upstairs. Neill and George were able to trace its source and to prevent further leakage, which would have otherwise caused substantial damage to a ceiling. Since then, the firm have regularly serviced our boiler and have also replaced the fan in the boiler when it broke down. They are willing to come out at short notice, even, as we found out recently, on a Saturday morning.