as above, local bike shop will sort it easily, for peanuts.
however, i have noticed that "trendy" bike shops tend to be quite expensive for servicing and repairs, compared to traditional bike shops. also the modern/trendy bike shops can be slightly "anti-retro" in their customer service attitude, and in their expertise!
another point about brakes, although it is nice to keep the original calipers, lets face it the raleigh base model weinmann single-pivot calipers are awful in practice (even with modern cables and pads). modern shimano dual pivot calipers do make the bike much safer and make spirited riding much better