I have to confess to being intrigued by the question. Can I ask why you specifically wish to sing Walter Pardon songs as you don't seem to be familiar with his singing?

"Old Boys singing" is generally pretty representative of the canon of source singers - not forgetting the Old Girls singing, of course. It's only, as Dick suggests, if you listen to a few of them for a little while that you get beyond age and quality of recording and begin to pick out their individual styles, and decide who you like best. Personally, I really like Sam Larner, Harry Cox and Fred Jordan.

For this reason, maybe a compilation CD would be a good place to start: there's a Voice of the People one, and Hidden English (on Topic), and A Century of Song (produced by EFDSS). Though off the top of my head, I can't remember if Walter Pardon is actually on any of them.