Hiya,
Just sharing the following tip/experience.
I needed to cut up a very old rusty metal ladder that had gotten itself stuck in a basement years ago (new developments made it impossible to move it out!).
Instead of sweating my thingies off with a manual metal saw, I bought an electric "everything saw" which has a wood and metal blade. It took 12 minutes to cut the ladder up. Magic. The saw only cost me 47 Euro (what's that, about £30 ?).
BTW, be careful with these saws, it feels and looks lethal... one slip and you'll cut your foot off ! ;-)