Die, you bastard, die!
"Thirty years ago I was the BBC political editor and there was absolutely nothing either left wing or right wing about our coverage. We were as straight as a dye then and I think it is absolutely as straight as a dye now.
It is "die", the singular of dice, not dye -
- The OED puts it under the “gaming cube” sense of die”
(f) In comparisons: as smooth, true, straight as a die.
f. 1530 PALSGR. 629 Make this borde as smothe as a dyce, comme vng dez. 1600 HAKLUYT Voy. (1810) III. 256 Goodly fields..as plaine and smoothe as any die. c1710 C. FIENNES Diary (1888) 151 Ye tide was out all upon the sands at Least a mile, wch was as smooth as a Die. a1732 GAY Songs & Ball., New Song on New Similies, You’ll know me truer than a die. 1877 SPRY Cruise Challenger xiii. (ed. 7) 226 Arums climbing fifty feet up large trees as straight as a die.
(I hesitate to blame John Simpson as he may be the victim of a cloth eared transpositor - and his touching naïveté is a wonder to be pointed and marvelled at in this age of lost innocence).