Considering the difference between the CL3 and CL4 is the speed control, I'd say the same is probably true for the CL1 vs. CL2. From the looks of it, this looks like the 36" bed.
Obvious questions: have you checked the condition of the headstock bearings, banjo action, tailstock action? You don't say, so I presume they are OK.
You can get a brand new CL3 with stand for under £700. Throw in a chuck with one set of jaws, that's around 850. Considering the condition, I'd say you'll be lucky to get more than £400 for this machine.