This is the link to listen to the Heart Breakfast radio interview
http://www.heart.co.uk/london/on-air/aod/?episodeId=efbca9f4-cc0e-4f69-8a71-9ba5cd20ab5f

There's also a video on their website with a chunk of it.
http://www.heart.co.uk/london/on-air/breakfast/watch-tom-hiddleston-on-heart-breakfast/

There's a point where TH is asked if he is single (this is not on the video) and he says yes, absolutely and that no, he doesn't intentionally go out to look for a mate.