The blue thing is a vacuum pump, which to the right person would be worth £500 alone, the rest of the parts are not worth a lot as most of it is cheap chinese rubbish and its rusty. You should be able to convert it to mach 3 or similer to run on single phase with maybe another £500 worth of parts/software.

A note on the rusty rails, these are usally case hardend so rust is not alway a big issue as a very light buff and oil will remove the surface rust