pb pb pb and marathon training

Didn't realise it had been so long since I had written on here.
It's been a busy few weeks.
Got a new pb at HPTT thanks to Rick dragging me round :) 21:54 and I won again as well!
Did too much though because my knee started playing up - typical - a week before Brass Monkey. So I cut back.
Brass Monkey was okay. Set off with Rick and we stayed together for the first 7 miles at which point I just couldn't push the pace. I was running with a knee support on and was very aware of how uncomfortable it was and the fact that I may hurt my knee more meaning my marathon would be compromised. When I realised I wasn't going to get my time I lost it mentally and slowed down instead of speeding up. The last 3 miles were hell. Instead of thinking yeah it's only 3 miles and I do that easily every Saturday morning it went the other way and I was thinking oh no that's another 23 minutes at this speed. Support from my club mates at 12 miles helped, but only for a short distance before my negative mental state took over again. I still managed a pb in 1:41:23, but it was 2 minutes slower than I wanted to get. I did get a new 10 mile pb in the process of 1:16:55.
I was fed up after the race because my knee was bad. I went to see a different physio and was amazed at how quickly she picked up on my problems. The usual tight calves and hamstrings, but weak calves and glutes and tight adductors to add to it. She also wants me to see their podiatrist to get orthotics rather than running in support shoes because I overpronate to different degrees in my feet. But, I am allowed to run because she wants to see how I cope with it. Great, except now I have a coldy type virus and feel dreadful. So bad that I missed my long run for the first time in months.
I am trying to think longer term now and aiming for Edinburgh. A fantastic seminar yesterday on marathon training. I learned loads about long runs and nutrition and listening to stories about pace made me realise how important it is not to set off quickly. I have an image of Helen's pacing balloon in my head and will keep it there to remind me. I can't do Leeds Half because I have to do a 22 miler that day so I am doing Sheffield Half instead. I have to use my race time there to work out my marathon pace. Tom's rule is double it and add 10%. Currently that would be 3:40. I fully intend to get sub 1:40 in my next half. Tom reckons that I am capable of a 1:35 half at some point. That sounds awfully fast to me, but is only really the equivalent of my sub 45 10k in terms of thresholds.
Looking at my race pbs my HM, 10 mile and 5k times are all in line and it is my 10k time that stands out as the best. Maybe 10k is my distance. That surprises me because I have felt more comfortable doing longer distances recently. I need to crack the mental nut though.