go to a local recycling place (used to be called the council dump) buy a 4.5 or 7k calor gas bottle ,then take it to a camping shop ,decide which size calor bottle suits you then buy a refill (swapping your empty for the filled one) and buythe regulator for that bottle + hose if you need it.this way avoids the high price of "renting" a bottle from new.
OK - so you can either buy a new cylender full of gas, or blag an empty cylender from a car boot sale, council recylcleing depot or ask your mates at work and get it re-filled.
A new full cylender will cost about £35 or if you can blag one it cost £12-13 to re-fill them.
Go to http://www.campingaz.com/ and on the top right of the screen you will see a link to where you can get them re-filled
BTW - 904 will also fit - just a smaller cylender but about the same price to re-fill it
Did the cooker come with a regulator? If it didn't, then you can look for either a Campingaz 907 bottle or a calor gas bottle, whichever one you can get for free or cheap Then you can buy the appropriate regulator for that type of gas.
Calor gas is cheaper than Campingaz; both are widely available in this country; Campingaz is available in France & Spain, but not calor gas.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets