Separate Cold and Hot Water Taps in the UK

Can anybody please explain why the Brithish Empire has not brought forward any engineer who was able to apply common human sense and combined the cold and hot water into one single tap? And why is it that no British engineer thought about putting both taps closer together. I mean come on, this is not brain surgery. Or is it me who is just too stupid to understand this bath room secret. can anybody disclose the secret how H.E. the Queen herself washes her hands without burning the left one and freezing the right?