ride as often as possible .. and time your self over the distances , then set your self target times , you will soon be knocking time off and getting fitter/faster .
and try to avoid the cars 
joe

Mix it up. Do some long steady rides, and some shorter, more intense ones.

Try not to get into the habit of doing the same ride day in day out, or you'll adapt to it quickly and reach a plateau.

Another thing worth varying is your cadence. Have some 'spinning' days, where you ride at a higher than normal cadence.

Also worth considering is some sort of high intensity interval training ride (google HIIT for better information ). Incorporate a number of maximum effort sprints into your rides, followed by low effort recovery periods. It's easiest to do this on an exercise bike, but by no means essential.

Hey Alwyn, i used to do time trials when i lived up in Essex, would love to get into them down here so lets find out where our nearest ones are & give them a go together.

Il be on the bridge with ma air horn buddy!

The a31 is quite hard, looks easy but its so open the wind really slows you down coming back up from farnham.