Hi TK
Im doing Burnham Beeches this month. My PB for this course is 2.07, its undulating, and its in summer. I did it in about 2.12 a few years back, and this time Im aiming at 2.15, factoring in the Sands of Time, and so on. So I guess Im about your ability.
At the minute, Im doing long slow runs on a Sunday, up to about 14 miles now ready for BB, I go v slow, and its all trail, up and down, I do about a 12 minute + mile or so. I also have built up to 7 miles at 10.20 pace, which I do once a fortnight or so. This works for me in that it gives me confidence. It probably wont work for everyone, and I have built up slowly over the past few months.
I also do 4 x 1 mile at about 9.10 pace once a fortnight. I find that v hard, probably too hard really, and I have cut those down now, preferring to do the longer paced run. I also swim, and a slow 40 min run too. One of the more experienced runners will probably come on and say Im doing far too much, but it works for me.
Have you tried the Smartcoach programmes on RW? They can offer you a programme to suit. If you are doing 1.41 for an undulating, how about trying Cardiff Half? I think thats in October, not sure. You could be on for 2.10 for that.
I have found the better quality quicker runs have the most impact on me, rather than the slower runs, although Im sure its a mixture of everything.
I would suggest an Autumn Half rather than a summer one, and a flat one too. What are you doing at the minute training wise?