I think 9 times out of 10 the guys will ask for photo's to offer guides on value.
In good condition the airsporter Mk 1 would be plus/minus the region of £230 and seen at a dealer/gun shop for £295
The correct early foresight hood that is often missing is key to desirability and no doubt value too.
Cadet Majors are odd, I've seen (bought) good at £75 and yet have seen up to £200 being asked, asked mind not necessarily achieved.
CC is a later one and is a .177 serial as all Cadet Majors are so are you sure of the calibre?