Thanks for all the tips and advice
Another problem I'm having is my average speed is around 19-25km/h (11-18mph ish), although I've only been cycling properly for under a month and only a couple of weeks on my new road bike
Does a higher average speed come from practice / experience or is there a certain way I should be training??
Jamman do you have a computer that logs your average? or is this as you look down the speedo at various points throughout the ride.
If you have been riding for a month and are averaging 18mph for ten miles already then I certainly wouldn't consider that a problem quite the opposite.
For now forget about average just get your bum used to the saddle and your body and arms used to the cycling position and concentrate on bumping up the mileage bit by bit. (effectively what you do in the racing off season)
Once you have been riding a bit and read a few books, posted your exploits on here read magazines and so on you will find that the law of osmosis will set in and you will have a better idea of where you want to take your riding and what training to undertake to get you there.
Distance riding requires different training to Time trials so you could open a can of worms with HR training, lactate threshold training, interval training and jump down a route that in 3 months time you may not want to go down.
It certainly won't do you any harm to pop down your local library and get a cycle training book out and have a read through the programs.
EDIT: To answer your question a higher average will come from riding more but there are certain drills such as interval training (sprint all out 30 secs -1 min then recover) and fartlek training (rider sprints off and you chase him down) leg drills that will increase speed but these should only be done once you have a base level of fitness