It was mentioned on this podcast:
http://tastypodcasts.com/podcasts/s...cast-real-ale-brewing-coco-simone-trisha-lynn
The brewer from Real Ale was in Northern Germany, and had a hoppy Pilsener called Jever. So the Hans Pils is supposed to be similar to that.
Note that the water profile in Northern Germany is different than it is in Bavaria or the Czech regions. They are probably using a different yeast as well.
In the podcast, the brewer mentions they use "all German malts, all German Hops."
BYO magazine did an article on the Northern German Pilsners, and
had a recipe that featured Tettnanger and Hallertau hops and used Wyeast 2042 Danish Lager yeast and a step mash:
http://byo.com/partial-mashing/item/1183-northern-german-pils-style-profile
I haven't had the Real Ale Hans Pils or the Jever Pilsener, but I am putting this on my brewing list for the spring so its ready for the summer.
I'll probably go with an IPA type water profile and use the recipe and mash schedule from the BYO article.
I'll also use either the 2042 Danish Lager yeast or 34/70 dry yeast.
Also mentioned in the Podcast, Real Ale Brewing doesn't filter or pasteurize, so theoretically if you want to make a clone, you can culture up the yeast they use.