Thank you for all your advice.... Definitely going to get a mirror now.
Would something like this work?
http://www.amazon.co.uk/Screw--Mirror-handlebar-Mount-Convex/dp/B009T3Z03Q/ref=sr_1_1?s=cycling&ie=UTF8&qid=1397593203&sr=1-1
Would something like this work?
http://www.amazon.co.uk/Screw--Mirror-handlebar-Mount-Convex/dp/B009T3Z03Q/ref=sr_1_1?s=cycling&ie=UTF8&qid=1397593203&sr=1-1