<Added> If you're 150K in, Deadly, it's worth checking if you're repeating scenarios, and try to cut out that repetition. Make each chapter justify it's place in the novel; that it's actually moving the plot along, and they're not simply being used to introduce new characters or slot in backstory or scene setting. <Added> And show those characters who's boss!

Thanks NaomiM...editing is going to be quite a bit of hack and slash I think! I have told the characters they have to behave but they do the most outrageous things sometimes and I feel I have to let them run for a while!! Still, Gone With The Wind was a first novel I believe...:D

See if you're doubling up on character types, and if so amalgamate them. Especially if you're using multiple view point characters.