Robbie,you are technically correct as IT was a tv mini- series butchered into a film length.The book is SO much better,you REALLY get to know and care about the characters,definitely one of King`s best.
Waterstones is selling the book right now (not that it's ever been out of print) with a great new cover - I shall do it. 1,100+ pages seems daunting. Last time I did anything of that length was as a kid (LOTR). It may well take me more than a week to read it.
I feel old, given the mini-series is almost 30 years old!