Couldn't agree more - have used NHS Direct about 3 -4 times since my son (now 17 months) was born, and always found them helpful.
However if you have any private cover (e.g. through yours/ hubbies work medical insurance) they often have a similar sort of service available 24 hours a day and will send you printed info too. Ours is with PPP healthcare (called Health at Hand) and you can phone at any time and speak to a Nurse, Pharmacist, Midwife.... It's a benefit people often don't realise they have!