Shackleton Operation Sunlight

I was wondering if somebody might be able to help me. I am trying to find out more about Operation Sunlight. I have been going through a log book to a Shackleton pilot (also served during the second world war) and on the 22nd June 1954 he lists his duty as “Operation Sunlight” in Shackleton Mk I “X” of 236 OCU. It was quite a long flight of 13 hours.

I was wondering if any members might be able to tell me what this relates to.

Any help would be great,

Johnnie