Interesting replies folks 
Had a look at the requirements for a GFA entry to the VLM, they don't cut much slack for us oldies; 18-40 3:10, 41+ 3:15! Will be waiting for my ballot notification, could just about run 3:15 pace for a couple of hundred yards with a lion chasing me.
Sub 40 10k is impressive, DrDan, must have a fair VO2 max for that sort of time? I know how much I was heaving after a piddly < 25min 5k.
Think I need a new HRM strap for my garmin. Originally bought a 305 with HRM, left atop my car after a run, never to be seen again. Although when in use my HR never went above 169 on a normal run, I was dismayed that my max is probably quite low 
One session badly missing from what I am doing atm is speed. Have done a couple at the running club and really feel the benefit afterwards but struggle from the halfway point onwards during the session. Last night was 40s fast, 20s stand still recovery X 16, it was hurting last night, the hobble back to the sports centre was not pretty! On the normal social run on Wednesday I do ok, but the speed sessions are another matter, I always end up with the girls, the blokes are flying machines.
Paul, do you do the parkruns? Sounds like you bag, flying round the course each Saturday am! Going along to the York one this week for the first time. What a great idea the parkrun concept is.