Christian McArdle wrote:
but what features of a drill should I be looking out for in
order for it to double up as a screwdriver ??

For screwdriving the following features are needed in order of
importance.

1. Reverse.
2. Pressure sensitive trigger.
3. Rotor brake.
4. Torque control.
Plus 2 batteries if you're going to do any serious amount of screwing at one
go.
Theres nothing worse than having to stop for an hour or more while the darn
thing recharges.
I laid a deck non-stop using 380 screws with my new Axminster 14.4v which
comes with 2 NiMh batts.