I have settled upon a run/walk plan for the Sunshine Coast HM on 30 August sunshinecoastmarathon.com.au/
I used a Galloway plan to do the 14 Klm Sydney City to Surf around this time last year - using a 2/1 ratio. I modified the actual plan and race by running down all hills - but this run is fairly flat, so I will stick to the run/walk ratio for the duration of the race.
This plan ( not from Galloway) starts out at 2/1 for the first 5 weeks and then goes to 3/1 - it starts out at 20 klm during the first week ( I had actually been doing more than this but right now this starting volume suits me as I haven't run much lately and am feeling a bit "underdone" . It has me doing 35 klms in the final weeks before the race (minus 2 weeks for a taper)
No tempo runs - no fast intervals, etc ----- just sufficient miles of run/walk to get me across the finish line within the cutoff time. I managed the 14 K last year at 7:30 mins per K - so if I can maintain that pace over 21 klms (after 12 months of running), I will be happy -- 7:00 mins per K would delight me!!