Don't trust the emails sent from ok. I received one with the header: Only a few hours left to purchase Multipack 13 x Extra High refills at 25% off. I immediately purchased them only to be billed the full price ! When I complained they refunded 10% and not the 25% the header on the email promised. I even sent them a copy of the email, but they still refused to honour the 25% discount as advertised. Very poor service, be wary as they have no respect for long standing customers and refuse to put right any mistake they make. Stal Baldwin (partner of A Stephenson) customers for years.