It doesn't seem to be listed in Ilford's Product Availability list of February 2007. On the site there is a request for products so you could complete that and see what happens. Also I think Kodak may still make a fixer with hardener incorporated.
No, you don't need it. I've always used ordinary rapid fixer and (gasp!) even stop bath. None of the famed pinholes, nor seeing the entire emulsion fall off the base.
Try without first, and you'll know whether you need it.
I shoot a lot of Efke and Foma film in sizes that range from 35mm and 120 rollfilm through 8x10 sheet film. I never use hardener with these films. Use of reasonable care in handling the film is all that is required to avoid emulsion damage.
Major manufacturers learned in the past that the way film base is made, stripped, and dried has a lot of influence on the way the film dries after processing. They also learned that the additives used to the emulsion has significant influence on this as well. Not very common any more, but many old films had plain coating on the non-emulsion side to even out drying and to minimize curling. I'm afraid to say that companies that make films that have curling problems don't seem to have cought up on these things...