Hi Rossy,
I reckon there are two golden rules for avoiding sticky, stodgey rice:
1)  
Thorougly rinse the rice in cold water before cooking.  I put the rice in a sieve and run cold water though it.  This removes the starch that causes the rice to stick.  If you don't rinse the rice beforehand, you will see that the water is cloudy and there will be scum on the surface
2)  
Don't overcook the rice.   Cook the rice only until it is "al dente" (i.e. ensure that it is still a bit hard in the middle of the grain.  Keep testing the rice by removing a few grains and tasting it.  It should only take a few minutes for Basmati rice.  If you overcook the rice, it will become stodgey.  Much better to undercook it than to overcook it.  Remember that it will continue to cook once you've removed it, unless you immediately rinse it with cold water of course.  It will also cook some more when you reheat it.
I reckon the easiest and most foolproof way to cook free-flowing rice is to do cook it in excess water (rather than by absorption):
1)  Thoroughly rinse the rice in cold water (as described above)
2)  Boil the rice in excess water (together with spices, food colour, oil/ghee, salt, etc) until the rice grains are "al dente" (i.e. still hard in the middle of the grains)
3)  Separate the rice from the excess water using a sieve/colander
4)  Rinse the rice with cold water (but I don't believe this is essential...it simply prevents the rice from cooking further and probably washes away a bit of the flavour) and allow to drain
5)  Spread the rice in a thin layer, on a tray (add more food colours at this stage, if required), and allow it to cool (put it in fridge if you intend to leave it for long)
6)  Microwave the rice, on full, for a couple of minutes (until steaming hot) before "fluffing up" and serving
This method produces perfect rice and is easy to control.  
Cooking the rice by absorption (as described iby Curry King), will undoubtedly produce a tastier rice.  I also often use this method, but it is more difficuly to control.  It is also no doubt the method used by BIRs.
Pictures can be found here:  
http://www.curry-recipes.co.uk/curry/index.php?topic=1180.0Hope this helps.