undefeated British world champions

[Mimmy]

Apart from Joe Calzaghe and Terry Marsh are there any other British world champions who retired undefeated.

[Deno1986]

Tyson Fury

[Loynesy]

Pretty certain there are no more British ones. There's only about a dozen or so, and many of them were probably only undefeated because external circumstances (e.g. Death) made them retire early - arguably Marsh fits into that category.