hi guys i'm sure this has been asked before. however, do i need to buy the big brown book or is there a cheaper book with just the ammendments in? i have been out of the trade for some time now but was looking to get back into it last year where i was due to do the 18th edition test, so brought the baby blue book etc. however as always life gets in the way and i didn't get to do it. so am looking to do it again this year but of course there is now another book and amendment 2. do i really need to shell out another £80 for the changes?