Normally Nordale. I am suspicious because they got loads of calls for paper and sold out. I started ringing around and the only place I could get it was Bere Regis. They also said they had received a lot of calls.
Maybe you should start trying large companies and hospitals. I get all my shredded paper (cross cut so nice and short) from my local hospital. They shred on a daily basis and I collect it once a week. I always have far more than I can use!