Which edition of Royal Marsden Adult book should I buy?Watch
The last version of this book was released in April 2020 and the one before that was in 2015.so obviously you want the latest version possible but do shop around ok as you'll probably find it at various prices .
You obviously want to buy the most upto date one where possible okay.
Try local book shops ( W H Smith's, Watersons, online as well ).
Borrowing one from the university library is also a good idea.