Of course it depends on circumstances, but I would say that you were likely safer near the middle of the lane in rush hour Stockport.
John, no joke, the drivers in the Stockport area are much more anti-cyclist than drivers in Manchester in my overall experience, and I cant for the life of me understand why. I know people who have been actually pysically 'pushed' by passengers as drivers overtake because they felt that they were taking too much of the lane up. Some of my neighbours actually think this is really really funny, and break out in fits of laughter when they hear of these events! They think of cyclists as eccentric's (and therefore me), and have therefore psycologically alienated and marginalised them.
I myself was threatened by 4 grown men in a convertible who threatened to get out and assault me because I stopped traffic at a toucan crossing on the A6 in Hazel Grove in rush hour, and (I assume) they were pis*** at the traffic.
I had every right to do what I was doing.
On another occasion a motorbiker came out from the left literally feet in front of me, I had to brake and swore at him that he should know better, and 2 old blokes on the corner pointed and laughed!
I managed to control my temper.
There is no way I would cycle in the middle of the lane in rush hour traffic, (the primary position I know) around these parts. Even the 'Cycling Officer' at Stockport council doesnt do that whenever I have seen him on his bike (even though he persists thats what we should be doing).
This is why I personally hold planners responsible for any injuries. They say they "dont have a choice, having inherited a flawed system", but they do have a choice IMHO.
John