Extra Easy Do I need new books ?

I have old Slimming World books from 2010 including the directory. I'm looking to re-start the plan. Do I really need up to date books or has nothing changed in the past year and a half ?

Thanks
 
Basic idea is the same...1 HEa, 1 HEb... 1/3 superfree at each meal etc etc. The syn values seem to change quite often though. This site is fab for being informed of any changes. xx
 
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