M&S appear to have taken a new delivery of the cycling chinos that @Blue Hills posted a couple of months ago. They have nearly all of the sizes in all of the colours:
http://www.marksandspencer.com/cott...2_1441204801_4fb181f9e7412cabc145fc140b189203
http://www.marksandspencer.com/cott...2_1441204801_4fb181f9e7412cabc145fc140b189203