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I wouldn't just take 5% off the quickest half of the 10k, since the assumption is you couldn't hold 19:14 for the 2nd half (as evidenced by the 19:45)
But 95% of the average 19:30 pace (so pretty much bang on 18:30) I think is definitely a reasonable goal...I did similar earlier in the year. Haven't run under 18mins for 5k, then did a 36:45 10k including the 2nd half in 17:55 and a couple 3.5mi races that would have had a better split than my 'official' pb. Have since improved on my 10k and picked up a HM PB.
Still haven't tried a standalone 5k though... maybe I'll go for Dulwich tooEither way, very good work. a sub 18:30 beckons!
Nice work. What were your 5k splits in the 10k? Aiming for those, less 5%, seems doable.