You do need to pre-book as she only allows a certain number on each session and the last time I asked which was about a year ago the whole day session was around £100. Everyone I know who has been on the session has said it has made a huge difference and for the better and well worth the money too..
I wanted to book last year and it was £100, I was asked for a modest deposit and the rest on the day. In the end I couldn't make any of her dates and I wouldn't have known enough to get as much out of it as I would now
Not sure if it is Liz Dunhill in particular, but NWGRC are holding a day session with Michael Coed at Grapenhall, Warrington. This will be the second one we have run and it is really popular so if you are interested early booking is advisable.