My kitchen sink has the single lever type hot and cold taps/faucet. I think something is going wrong with the seals because it chatters a few times when I turn the hot off. I cannot obtain seals from the local hardware/builders merchants. After bit of research it would appear that different manufacturers have different seal kits. Some are a ball type valves, others a cartridge type, apparently it is an easy job to replace them but I do not want to dismantle without new parts in case it is broken and will not go back together again. I do not know the manufacturer, nothing is marked on it apart from “Terla EN246” which I think is a British Standard. Any ideas how to identify it, and where can I get repair kits?