Where can you find a butterfly pen in the UK?

I'm assuming you mean pens with butterfly's on them, here are some links to where you can buy them from -

.petitesouris.co.uk/acatalog/Princess_Shop.html

.pinkheaven.co.uk/products/butterfly-pen

wendysaffordableweddings.org.uk/butterfly-pen-set-p-1135.html

cgi.ebay.co.uk/Pink-Butterfly-Pen-Hair-Elastic-SetGirls-Party-Bags-New_W0QQitemZ170613950838QQcmdZViewItem?rvr_id=227350949414&rvr_id=227350949414&cguid=a10c504812e0a47a09778627ff780fcf