Depicted in working and full dress 1854.
My interest is at the moment with this unit in the Crimea who were attached to each division along with Engineers and artillery. The Royal Sappers and Miners were amalgamated with the Royal Engineers in 1856 - more information and at the RE Museum page
This is a photo taken shortly after the Crimean War is of a highly decorated sapper Kester Knight who eventually became a Yeoman warder of the Tower. Source of photo and his biography here.
Photos of RE personnel of the period here