Is this a cottered crankset or a square taper one? Raleigh cottered cranks are fairly commonly available (at least on eBay here in the UK) and I don't imagine there are too many sizes. However, bent cottered cranks seem to be fixable - my uncle managed to put a 20 degree bend in a cottered Raleigh crank while doing something dumb as a student (he won't say what), and he and my grandfather were able to straighten the crank with a big bench vice. I now have the bike he did that to, with the original crankset, and it's done a lot of miles with no trouble.

If it's square taper, any generic replacement should work assuming the square hole for the taper is oriented the same (some of them have a corner pointing along the length of the crank, others have a flat side of the square there) and that you get the correct taper for your spindle (ISO taper vs JIS taper are the two main ones, although an older bike might have something weird). Don't be too set on finding one that matches in appearance, though.