It's in the corridor downstairs on the way to the toilets of the Camden pub, the home of such stars as Ms Winehouse, Mr Doherty & Mr Borrell out of Razorlight.
Many thanks to Andy for braving the pub to take the picture & send it to me.
I almost bought this mirror on eBay once (SuckUK sold out of their stock a while back). But in the end thought that £60 was a bit much & also didn't want to have Old Street sticking out of my right eye all the time.
I settled on the much smaller & affordable pocket sized one, which I've actually never unboxed and will probably end up as someone's Xmas present.
Thinking about it, I bet some of the Hawley regulars can find a fair few other uses for this credit card sized mirror. So perhaps it should be in their back pockets too.
However, if you fancy getting a similar reflection to the wasted and famous in The Hawley Arms, you can buy the full sized mirror Tube map online at various places including iwantoneofthose.com.