A big thank you to Stewart S for recommending that book by McKenzie.
I passed the details on to my daughter who suffers and she says the exercises are amazing and effective.
So, worth noting the book.
Nick

really pleased it's helped
I spent a fortune on a chiropractor and physio without any progress but within 2 weeks of doing the excersises, the sciatica went.
I'm not totally back pain free but it's definitely made a huge difference