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. 