Not really a debate Jonathan & if you were 30 years older then you might be joining in lol. Sure most on here are more than capable of working with both even if they knock metric a bit, just a bit of fun really. I didn't really have a choice but to learn both. I was brought up learning feet & inches, my engineering training was mostly imperial but there was a bit of metric thrown in. When I got on the workshop floor the Navy had a combination of metric & imperial machines so you had no choice but to work with both.