Well next year's London marathon will be a big wake up call for me. I've checked back through my strava log for this year and, so far, I have done exactly 2 (yes 2!!) 'pacey' runs. The first was a lunchtime run along the canal in Leeds and even that had a hill of sorts in the middle and the second was the relatively unhilly Commondale Beacon fell race a couple of weeks ago. This and this. I found the canal run easyish mind although the fell race was a fair old gut buster. Sub 3 hrs 30 might be a sensible goal for me