Thanks both - I thought from my training that I was probably 5 secs up on my zones and that gave me a shot at getting close to 32 mins but I surprised myself!
Okay proper results out now rather than my stopped the garmin when I got round to it time.
31:17 (so actually a 5:56 last mile) and 20th place out of 128. 8th M40 but only one M50 in front of me so I'm getting closer to a level that I just need to maintain for 5 years

2nd Unattached but never prizes for them as the Running Clubs organise the races (which is fair enough)!
The people in 22nd,23rd and 24th who were 17 to 26 secs behind me all ran sub 40 in the 10k race I ran 42:10 for last September - so I'm getting there.
Cheers, Skinny