To be honest I just went for it in both of the races!
For the marathon my training was geared towards getting under 3.30, my only previous marathon being 3.49 last year so it was easily a pb. Whether I could've run it harder had I set out faster....I doubt it as for the first 6m or so I followed the 3.15pace setter but eventually settled back into 8min miles and then lost the couple of mins I'd gained early doors over the last few miles as I slowed a bit.
I was concerned going into the 1/2 that I would give it a go and collapse half way round! I set out fairly quick(for me) doing the first few miles under 7's but settled into 7min miles for the most part. I have to admit that I slowed over the last mile resulting in a time of 1:32:32, which was just outside the pb I got at Alloa 1/2 earlier this year (1:31:46). I was surprised I managed to maintain the pace as long as I did but I certainly wouldn't say I felt great throughout.