>>416 "“Tom Hiddleston was my mentor at drama school but he’s the most hard-to-contact mentor ever, he’s always so busy.”

http://www.tvchoicemagazine.co.uk/interviewextra/james-norton-grantchester-0

I don't know if the original interview was this or the one in the Glouchestershireecho as reported here

http://justjamesnorton.tumblr.com/post/139857439084/an-interview-with-james-photo-source-if-ever