Half marathon training for &lt;1:20 - looking for books/resources Hi all,

Just wondering if there are any books/training programmes out there to help with planning out a half marathon training cycle? I know theres a load for marathon training, and I've got one which has been pretty handy, and there are a few HM guides on amazon but wondering what the quality is like?

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For reference:

My current PB is 1:22:43, came in my latest marathon training cycle (the marathon itself went horribly horribly wrong - but I got to meet some lovely paramedics :D). 

At the time I was doing around 40-45mpw, and that run was at the end of a 50-ish mile week on a hilly-undulating course. I also wasn't doing any real speedwork, just volume and some marathon paced miles. All in all though I feel like there is at least another minute or two to come off without too much bother if I focus on it...

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