Lee: I looked on my bottle of fixer. It has a "fold-out" paper containing all the info you should need.
Film and paper : 1+4
I think the difference with the paper is for those wishing to use Ilford's method of fixing, and the second for old foggies like me who want the more classic fixing methods. Actually a test several years ago indicated good results with Ilford's method for me - on RC paper at least.
Truly, dr bob.