What can I use instead of swede (rutabaga) when making pickle relish I want to make a British-style pickle relish at home. I think the best recipes involve swede (rutabaga in the US), because it gives texture and flavour, but isn't overpowering. 
Unforunately, I can't get swedes where I live.

What would make a good substitute?
I am a big fan of swedes/rutabagas. When I can't get them I use turnips, beets, daikon radishes. Carrots/parsnips add some interesting flavor as well.

A couple other vegetables that are crunchy and nice-flavored but more exotic are celery root or jicama.