Quite fancy starting to read Terry Pratchett but not sure which one to start with . . .

[BalloonSlayer]

any ideas?

My absolute favorite is Reaper Man it's completely amazing. Read it. READ IT NOW!

his other best books (IMHO) are;
Small Gods
Thud!
The Wee Free Men Series
Amazing Maurice and his Educated Rodents
(The latter two being young adult). Like everyone's said, it doesn't really matter where you start, they don't have to be read in any particular order

I will sit on the fence and and say to either start from the beginning, or read the Watch books first.

Also wanted to point out that Radio 4 extra is starting a serialisation of Night Watch tonight at 6. My Favourite

I started with Mort and loved it - but don't think you can go too far wrong if you started with either the Witches or the City watch books.

the first one, The Colour of Magic, is very good and might be a good one to start with. I personally like the ones about the witch Granny Weatherwax very much, the first of those is Equal Rites, which is another good one. guards! guards! Is the first of a number about the Night Watch, and is quite a good one. my personal favourites, and their main characters, are;
Reaper Man (Death and the Wizards)
witches Abroad ( Granny Weatherwax and Co)
the Last Continent (the wizards, and their housekeeper)
the Fifth Elephant (the Night Watch)
going Postal (a dashing conman)
unseen Academicals (the Wizards and their servants)

the Discworld has changed somewhat over time, in recent novels it has become less magical, and there tend to be fewer laughs and more discussion of social issues.

Totally agree that Good Omens is a great book to start.

Does anyone else, when disobeying the instructions they have been given by their Satnav, imagine there is an Imp in there screaming "I told you to go the other way!!!". Or is that just me . . .

Oh, and I love Vimes and anything to do with the NightWatch.

don't do it! it will end up with 16-sided dice