If I could give zero star, I would. Avoid like the plague. South Star Plumber Ltd carried out a "boiler repair work" for me. The boiler was not repaired. They just adjusted the gas valve however the minute the guy left, the boiler stopped working with the exact same problem as before, leaving us with no heating. The problem was misdiagnosed as when I called out another gas engineer, they confirmed that the cause of the problem was something else entirely. Later the manufacturer also confirmed this. I told Southstar about this and requested a refund for the repair (I didn't dispute the callout charge). They refused to give me a refund, despite the evidence that they misdiagnosed the problem. Dishonest, terrible people.