Hello, I'm not going to be there but there is a flowerbed with a wall to go up and another to gap to at the top of canning circus! It's round the back.
Thought I'd just point out a spot I found, ha.
http://maps.google.co.uk/maps?f=q&source=s_q&hl=en&geocode=&q=canning+circus&aq=&sll=53.800651,-4.064941&sspn=18.650964,57.084961&ie=UTF8&hq=&hnear=Canning+Circus,+Nottingham+NG7+3NE,+United+Kingdom&ll=52.955762,-1.163059&spn=0.001157,0.003484&t=h&z=19&layer=c&cbll=52.955762,-1.163059&panoid=nJv6RgC-wjyDWwoqg6AuWw&cbp=12,72.04,,0,5.55
The bushes in the pic aren't there, there is some plants though.