Can anybody suggest, where I may be able to order online, a supply of resistors, suitable for using to replace old ones when restoring radios? Preferably in Australia.
2-5 watts if possible...
Any suggestions welcome.

Try :

EVATCO in QLD

WES in NSW

That's rather unusual in its presentation?

To keep the inventory down and for the voltage rating, I stock mainly 1 Watt resistors; Which most of the supermarkets have. Under that wattage very few stocked, but you do need the odd one in the other types range to get closer to the resistances in AGC and odd transistor set ; 1920's Grid leaks: physical size.

5 & 10 Watt only replacing some field coils, although I have ordered in bigger "feed through" chassis mount types from RS.

2 & 3 watt Screens of some Little Nippers (10K) and the odd Cathode & odd Choke replacement.

Heavying up resistors can have serious consequences: It is often better to have back bias resistors & those often seen in plate circuits of rectifiers burn on fault than the transformer.

Note some of Steve's adds as well

Thanks guys, yes I'd rather burn a resistor than a transformer!

What type should I use, Carbon film or metal oxide?

I use both and really have had no issues. I try & avoid metal oxide in the RF section and that is also an area where wire wound should be avoided.

Oh bugger, I just ordered a 500pc kit of metal oxide ones...
I tried just ordering the ones I needed, but the total was $10 less than their minimum order of $20, so they cancelled my order and refunded me, but I didn't learn of this until today and wasted a week waiting for nothing, so made an executive decision and ordered this kit for $69 U.S.with 7 each of 85 values from smallest to largest..
Reasoning.
Sure I'll be stuck with lot's I wont use, but I'll have all the values I need and odd-ball ones in case I require one and I can top up any I use more of etc.
Damn if I didn't get the wrong sort!
The RF section is the ones I want t replace mostly so I'll need to either try them anyway, or order carbon film ones now next week......

Contact Stephen Savell. He supplies them.

The metal film resistors shouldn’t be any make or break in a radio, they are used in VHF/UHF.
They should be less noisy, and better temp coefficient, but I don’t know this for myself.

Every passive component is also every other passive component, and it’s fairly well known that
wire wound resistors make good inductors in RF circuits when you didn’t employ them that way!
So they will drag down oscillators, and especially for things like making up dummy loads,
can mismatch AC impedance even though they were the correct DC resistance.