is there any where I can get a ready made positive battery cable of approx. 3 feet long with the correct connection to go on the starter solenoid of a 94 893 Honda fire blade as cable at the moment is only about 6 inches and would like to move solenoid away from battery

Halfords do pre-made battery cables, red and black in various lengths if you are looking for something quick. If not they are simple enough to make, you just need a blow-torch as a soldering iron wont get large terminals hot enough.

Biggest Halfords do is about 1ft