Robbo v Schweizer
Banjo,
The advice I received (which I took) from a number of reputable pilots, was that if I had any thoughts about taking my PPL further to CPL, then learn on a Schweizer. It has a "proper" cyclic (please, Robbo flyers - don't have a pop at me for that!!) and is robust aircraft that was designed for training whereas a R22 was designed more as cheap, personal transport rather than as a trainer.
There is also a theory (and I don't have any figures to back it up) that an R22 is harder to learn on and could therefore take more hours to pass which could wipe out the hourly savings compared with a Schweizer.
On the other hand, there are more R22s in the country from which to choose. If you want any info on the place where I trained, please PM me.
Cheers
Whirlygig