Here is (what I believe) you are considering: Silverline bandsaw:
length =3D 1.425 m =3D 55=94, 350 W =3D 0.54 HP, =A385 =3D $153
Most people recommend bimetal blades for cutting steel, but I=92m not sure how easily they will be found in the size fitting this machine. The costs might be nearly as expensive as the bandsaw itself. As others have mentioned you still need to slow down the blade speed for cutting steel (electrically or mechanically). This has also been previously discussed on RCM:
13 hits =96 =93blade speed=94 + =93cutting steel=94
Also the blade width (depth) will limit the radius of your cuts. You may still need to resort to =93chain drilling=94 holes for tight curves. Scroll saws have =93metal cutting=94 blades, but they are usually the high carbon steel ones and better suited to nonferrous metals. Possibly you could adapt (grind, file) some bimetal hacksaw blades to fit a scroll saw. Additionally you may also still have to modify the machine to reduce blade speed to make the blade last. Most scroll saws are designed only for cutting wood.
Bimetal jig saw blades are commonly available, if you want to consider using a jig saw.
Horizontal/vertical bandsaws are designed primarily for cutting metal (i.e. have correct blade speed, etc.), but they don=92t normally come with good tables when used in the vertical mode. If you get one of those you might need to improvise a better table if you frequently use it in this mode. Also they usually come with deeper blades (1/2=94 or better) to resist deflection when used in horizontal mode. Still, it may be possible to adapt one for your work.
Certainly a plasma cutter fits the bill for some of the work you describe, but it may not be within your budget:
188 hits =96 advice + =93plasma cutter=94
I=92m not sure of all the resources you have for searching for used tools in the UK. If you haven=92t considered it, you might try: