Are all shower heads universal in the UK?

Yes, the vast majority of shower heads and hoses in the UK use a standard 1/2-inch BSP (British Standard Pipe) thread connection. This means whether you are replacing a fixed wall head or a handheld shower on a slider rail, an Aqualisa replacement head will simply screw onto your existing standard 1/2-inch shower hose or arm. You typically won't need any special tools or adapters.