So I finally got myself a proper MIG (Clarke 150EN jobbie), and it came with a refillable Argon bottle (empty) and an Argon regulator.

Now I don't think I need argon, and it's pricey as, so I want to weld with CO2.

I'm a complete newb when it comes to MIG bottle and regulator standards, so can somebody tell me:

1) Can I use the argon bottle and refill it with CO2?
2) Can I use the argon regulator with a CO2 bottle?

Or do I just need to get a new regulator and a new bottle? Obviously locost solutions preferred.

Thanks,
Pavs

Your local pub will have CO2 regulators as they get them for free, if you know the landlord he may sell you a cylinder as well.

Just re read, argon cylinders and regulators are totally different from CO2 ones

i don't think anywhere will fill a argon cylinder with co2, they're usually painted in certain colours to show whats in them,
like this http://msds.chem.ox.ac.uk/cylinders.html