Overwintered sweet potato

If it's a long hot summer, you should get something - but whether you think it's worth the effort at the end of  it, is another matter 

I grew one in a polytunnel and got a few skinny roots like carrots, good luck if you try

Hi Hasbeans

You plant the slips (shoots) rather than the whole sweet potato, unlike regular potatoes. The shoots will root in water, so 1 potato will give you a few plants.

I grew some outside about 5 years ago they were lovely attractive plants, however I got a bunch of spindly carrots as the end result and the little slugs had nibbled them all over.

I would recommend a little cloche tunnel, plenty of feed and some organic slug pellets