Been searching for drills and finally found something which is budget and Li-ion! :D
Ok, one not so good thing is it only has 1 battery, however it can stay charged indefinitely as its li-ion. You can also keep it on the cradle (much like you can for phones etc).
I checked out the reviews, not many around worth mentioning (argos doesn't count) but worth a punt. I remembered Robert Dias had a clearance of these for £35, was tempted but didn't need a drill then.
Don't think many can beat a B&D Li-ion 14.4v for £30.. :D
The Black & Decker Lithium Ion Drill Driver is cordless with 14.4V power. It has a variable-speed trigger for better control, and a keyless, metal, single sleeve, knurled chuck to improve gripping. The chuck features 24 settings for precise torque. This compact drill has two speeds, high-speed for fastening and assembly jobs, and low-speed for drilling and higher torque applications. Battery charger and screwdriver pieces are included for this drill.