Tenjiso: pacers were the least of my worries at MK last year. Weather was worst ever!!!!!!
The weather contributed to my pacing confusion. To start with, one of the early mile markers seemed well out (though I had to assume it was the garmin), then at around 8 miles my Garmin was about 0.25 miles out
I lost all confidence in using the Garmin to pace myself, only to then be dragged along too fast by the 4:30 pacer until I let him go off somewhere around the halfway mark. Of course, now I know that the course was amended due to flooding, which added the extra 0.2 miles, so I should have kept the faith with the garmin 
My pacing was all over the place on the day, but I've been more successful in subsequent 10k and HM races. I put the latter success down to pacing the current mile, and not worrying over any (generally minor) pacing mistakes in previous miles. This helps me settle into a rhythm, rather than speeding up or slowing down to try to get back "on track". Hopefully I can keep my head and apply the same principle in Brighton!
Also, let's hope the weather is a significant improvement! 
Today I have a rest day. Tomorrow is my first VO2max session of this marathon program.