Hi Elgin, used the P&D 55-70 mile schedule for the first time to train for VLM2010 and got a 16 min PB (3:38), so yes, I think they do work. You will probably curse them about 6 weeks in for making you do yet another medium-long midweek run (these are generally 15 milers) but I think the additional longish runs are crucial in your marathon preparation. I was able to run 26.2 miles comfortably, 2 dead even splits of 1:49 each and felt good throughout. Apart from doing my vastus medialis in at mile 17 when I stopped abruptly to hug a friend it was a very comfortable run. Hey, I'd never thought I'd say that about a marathon. I'm known to die a slow and painful death from about mile 18 normally
Listen to Moraghan, he's a legend when it comes to great advice.
PhilPub: I did struggle to find suitable Saturday races. In fact, I didn't do a single one and just fitted in another 6-8 miler at an easy pace instead. There are of course always parkruns but I guess 5k isn't really the optimal distance for a marathon training sharpener.
With respect to pacing: I paid zero attention to pace on my Garmin and trained purely by heart rate. P&D give percentage brackets of HR for the different runs and I stuck to them religiously. I. e. training was by effort, and not pace. Of course I checked the pace afterwards and put it in my training log - it comes with the OCD

.
At the beginning of the programme, pace made
very depressing reading but I stuck with it and saw it improve dramatically over the final 6 weeks.