Go watch it.
If you have netflix it ont cost you a penny and you will be supporting an independent documentary.
For those of you paying attention at the time, not much of what happened will come as a surprise (though the money Tony Blair Inc has made since leaving office might be a surprise to some), but there are many younger viewers who may not have as clear a recollection or awareness of events that happened at the time.
PS everyone at the time knew that the intel was a farce. No one believed it. If anyone says they thought otherwise, they are lying.