Yup, look after those knees Steph! I did look at the Hokas and ended up with the Bikilas - go figure!!
My plan for Lochaber is to run 1 min/mile faster than last September and feel pretty confident but running another minute or more faster in another 6 months to get to 4 hours is gonna be a much bigger jump so yes, not sure it's possible so quickly.
A sub 4 hour marathon would have me running faster than my (current) 5k PB for a lot longer!!!