Weather forecasts in the UK changed to Celsius in the early 1960s (over fifty years ago). I don't know of anyone in the UK who complains about reports no longer being in Fahrenheit.
Liquid goods in the UK are listed in milliletres or litres. In the US, fluid ounces (fl oz) are still commonly used. (The exception in the UK is pints for beer and milk).
Similarly, walk into a UK supermarket and solid goods are labelled in grams and kilograms. In the US, it's common for goods to be listed in pounds (lbs) or ounces (oz).
Also in the UK, dimensions for goods/products is always in metres, centimetres or millimetres. A lot of people still use feet and inches to describe a persons' height.
So yes, we do use a mixture of metric and imperial in the UK. However, the UK and US are not "pretty much the same" when it comes to metric.