I've managed to remove it. The pedal rotated ok on the inner/frame part of the spigot but was tight to point of seizing when moved towards removing. Copious amounts of WD40 and 3 in one appeared to be removing 46 years worth of rust. 2 hours of rotating the pedal no doubt helped but pouring boiling water onto the pedal boss to expand it also helped and after drifting and hammering it finally came off. Now for the power coating! Thanks for the help folks.