I'm based in Southampton. Also thinking of doing the Portsmouth half but away the night before so might be difficult. I'm doing the Fleet half in March as my pre-marathon half but would like another half before that as well.
Just back from a 5-mile race. The target according to my sub4:30 planner on RunnersWorld was to do it in under 45 mins, and I did it in under 43, so I am well pleased with myself. This is also with a but of "shuffling" in the schedule because I'm meant to do this race at the end of week 4, rather than the end of week 3. I did run a mile on each end as a warm-up and cool down, so a total of 7 miles today. Next Sunday I won't be racing, but will aim for a 10-11 miler as the long slow run.
I'm also following the Runners World Ultimate sub4:30 planner. I'm on week 3 of the 16-week planner so I think I'm okay. I've done all the sessions in there so far - although on my Sunday long run I did 9 miles instead of 7. Oops