With 68118 behind which appears to be acting as shed pilot, it being there from the end of December 1955 until August 1957 by which time the compound was withdrawn. The latter appears to have smaller numbers than the other photo of it bagged up there!
This is almost certainly 1956 when it was definately bagged up in store there shortly before withdrawl in February 1957. Note that it clearly has a cycling lion emblem on the tender despite being dirty.