Lovely pics, I remember when one of these was on every larger site in the country. On the bottom pic the 25 SC has the A frame I mentioned, the jib would be dropped onto blocks, split in half, then link bars were added from the top of the red A frame to lugs on the jib base section, allowing it to re lift, machine move forward till jib sections overlapped, re lower & add the angle iron & threaded rod joiner bars, re lift with upper jib section stowed under lower. A compact neat safe unit to transport. Made up by Pearce's fitters in workshop.
I would guess the 25 SC was a true crane with one brake pedal in the cab, as the 22 was built as either a twin drum ICD universal crane excavator, or a lift crane only with a 'reduction reverse' stub shaft for 'power load lowering' to save the brake overheating. I knew of manual, part air, (air assist on the 3 most used functions) heard of full air, & a version using hydraulic motors throughought (perhaps a prototype, very slow in use, no good except as a lifting machine I was told) Last new 22 was built 1981 in UK (Last 22B built '76 in USA) After that any new ones were 'ground up' factory rebuilds to as good as new. Excellent reliable simple machine. Believe some made under licence in Sweden?