QUOTE("Master Jmd")
2004 Currency Issue designed by Bruce Rushin (initials on direct right hand side 'spoke(?)' of centre design). Bimetalic. With four concentric circles representing the Iron Age, 18th century industrial development, silicon chip and internet. Edge: STANDING ON THE SHOULDERS OF GIANTS.
2004 Commemorative Issue. Commemorating 200 years of the Invention Industry Progress, and honoring the Cornish inventor Richard Trevithick, 1804-2004. Bimetalic. Depicting Trevithick's 1804 engine, 25 years before George Stephenson's Rocket.
(Both coins in my collection of decimals, circulation finds).
I am vey suprised that you have never come across a £2 coin in your change unles of course you are talking just about these two designs!