KK - well that course should suit your PB attempt as if you're on target at halfway you know that the toughest part of the course is behind you.
Mr Bojangles - try and find one race a month to do, they will give you mini goals to work towards during your marathon training. Your races will be instead of your long Sunday run so if they fall on the weeks that you should be doing the longer distances we can tweak your training plan so you don't miss all the long runs.
There's a half marathon at Sturminster Newton, 2nd of August I think. Lovely race, I'll probably be running that myself.
KK - are the hills in Liverpool evenly spread out on the course?
Good luck with the 5 miler, lovely to have a guaranteed PB in the bag
mowzer - well done on the Forces March, quite a tough event, you are amazing.
mamafox - I haven't given a Level 3 much thought but I certainly wouldn't introduce complicated speedwork, most marathon runners lack endurance not basic speed. I'd probably have a few mile rep sessions, higher mileage and much more racing. Racing is the best speedwork of all.
Mr Bojangles - you need to enter some races! You would run a 10k race much faster than doing a time trial by yourself. Look for some good club races, I guess you're in the Bournemouth area, there are a lot of good races in that area. One of the most important elements of my training plans are to race once a month.
Yes, you can do Level 2, if you stick to the long run pace you should be fine with the distances.
Sam - I think you should race the half marathon to get the best time you can.
A 46 min 10k put through a race predictor says that you can do a half in 1:42, which is probably a tough ask, without endurance training so maybe start at 8 min/miles and see how you get on? You are a much better judge of your fitness than I can be.
Hopefully, you'll get a good PB and we can recalculate your training paces.