Instructions:20% off code found for Ryman stationers - BLACKF20
They are not usually the most competitive I don't think but this time they had the cheapest price around for some pens and things my daughter wanted, so worth a look.
Also Quidco cashback is currently up to 20% for many stationary things and this code is approved by them, so potentially a decent saving all in. My purchase tracked very promptly.
Ryman also offer free click and collect if you have a store near you, otherwise p&p charges will apply.
Not the most exciting purchases but hope it helps someone :)
EDIT- No end date given on Quidco for expiry of the code but given it is Black Friday related maybe Friday or over the weekend?