Sounds good, I know for a fact it's wrong from people 'going round the block' we would call it to get to my parents house in the area using Sat Nav, it was always a nightmare, I usually leave this routing alone in case I break something. 

All I did was join the driveways across this imaginary dual carriageway to get to the other side. I might give it a go if I'm feeling up for a challenge at some point.