Picture posting is enabled for all :)
Just off the top of my head because I grow them, artichokes (globe and jerusalem), asparagus, scorzonera (and salsify? But I haven't tried it)http://www.perennialveg.org.uk/ this gives exhaustive lists, and sources.
Victoriana Nurseries do a perennial cauliflower which i have grown now for 3 years, smaller heads than normal but delicious.
went to Victoriana site they have 5 nine star plants for £6.50 which ive ordered but wont get delivery off them till September as they've sold out plus ordered quite a few different flavoured Mints which I love but the other half hates because of their spreading habit So thank you Utopiacraig for putting me on to them
Speaking of perennials, any idea what this is. It comes up every year behind my greenhouse.