Spotted these this morning, and thought they may be useful for those of us with GPO telephones and would like to have a longer cable on the handset, especially for the wall phone models... :)
http://www.ebay.co.uk/itm/130851844065 ( dead link 03-14-21 )
They also have a few other useful GPO parts, especially them unusual screws needed for the 200 series pyramids to attach the phone to the bellset... :)