My itemisation limit used to be 50p, but I'm nosy and wanted fully itemised and yes it's an extra £1.
I even called up one month to complain it wasn't fully itemised, whie on the phone I had a look and was embarassed to see call charges for 12p and 15p, meaning it was fully itemised.
Extra embarassing when you work for tech support and can't read a web page properly.