pier gynt brussel sprout seeds

Does anyone know if these seeds are still available to buy? I have searched the internet but to no avail! They are for my dad. He has been growing them for years but last year was the first year he couldn't get them. Any help would be great  

The shop on this forum has an alternative:

http://www.allotment-garden.org/greenhouse/seeds/brussel-sprouts.php

Good luck

Either it is an old form needing an update or the seed will be at least two years old, that's when the producer declared stopping them. So nobody much possibly has any fresh seed. Which is OK, a few years should be fine, just hold that in mind.