Went into local City Electrical today, they stock Clipsal filtered sockets exactly the same as these:
http://www.screwfix.com/prods/10502/Electrical/Switches-Sockets/White-Moulded/Clipsal-Polycarbonate/Clipsal-2G-Surge-Clean-Earth-Skt-Polycarbonate
Could'nt believe it when they quoted me...