Welcome BB, Nice to see you...
Sounds like you're playing your cards right with P&D. Even if you don't follow the schedules exactly, the books should give you a good insight into what you are trying to achieve with each run.
NDO Yes, doubles made a big impact on my times within the space of 6 weeks, although it's worth bearing in mind that my body has been trained very hard before and I seem to be able to recover very quickly from training. Don't ignore quality (aim for 3 good sessions per week - like tempo / threshold runs / short races) and make sure you're eating plenty of protein to help your muscles recover.
3.5M race Prize goes to me :) It was very hot at the start so I thought I'd go tactical rather than blast away looking for a super-quick time. Was probably a wise plan as despite jogging the first mile I did struggle at the end:
Mile 1 - 5:23
Mile 2 - 5:15
Mile 3 - 5:21
0.5M (0.57 on GPS)- 3:08 (5:33 pace)
Result - 19:08
So ran a pretty good 5km (about 16:40, and no, I'm not claiming that as a pb), but had nothing left after that. At least running low 5's is now feeling slow, so will persevere with the middle distance training for now. I'd like to find a 5000m and aim for something around 16:15 in the near future, although I believe times obtained on the track are not allowed in this forum's rankings.