Being English, I use both.
Metric at work for engineering drawings, etc. and Imperial at home for larger construction projects, etc.
Our shops generally sell things in Kg as they were banned from using Imperial a few years ago although that is now allowed again.
All road signs are in miles and yards - I think there is a law which states that they must be.
We also use feet and inches to express our height and unlike the US which just uses pounds for personal weight measurement, we use stones and pounds. So an American who weighs 171 pounds would be 12 stone and 3 pounds here.