I don't know whether exact replacements would be available -- can't see enough detail in your photos. There's an eBay seller named Cyclomondo (Greg Softley in Oz)
http://stores.ebay.com/Cyclomondo_W0...Q3amesstQQtZkm
who offers a lot of Raleigh decals. My favorite is the script logotype from MnHPVA Guy's (1957?) RRA. Greg has made it in the original white/Silver, and at my suggestion, black/silver.