Weed identification

I just moved into a new house. On turning one corner of the garden I keep finding these strange "radish" weeds. I've never seen them before.

They can be alone or joined in a string along a single root. Does anyone know what they are?

I would say they are wild raddish (Raphanus raphanistrum) if you google weeds like radishes you will get -http://www.eattheweeds.com/radish-mustard%E2%80%99s-wild-rough-cousin/ or - http://www.grdc.com.au/Resources/IWMhub/Section-8-Profiles-of-common-weeds-of-cropping/Wild-radish This site has detailed descriptions and it sounds like they are best got rid of. I hope this helps. Cheers, Di