try looking here on ebay for the regulator, not sure on the quality though, but for the price looks good.
Then you will need a needle vavle from here again from ebay, please dont be put off that it is from germany, many people have used that ebay seller with good results.
You can then either use disposable bottles, which you will need an adaptor for aqua essentials have these, or why not use a fire extinguisher which again look on ebay, you can normaaly get a 2kg for about £28.00 delievered.
Thanks for the link, is that machine mart stuff no good then? (a bit more expensive but the regulator looks a straight fit for the bottle, the adapters on aqua essentials seem to convert a disposable regulator to a refillable one).
What's the needle valve for btw? is that just so you can turn off the CO2?
I've had a read of the fire extinguisher before, I wanted to avoid that tbh - not keen on the possibility of explosions
the only reason i put a link to the reg was because of price, even if you buy from machine mart you will still need a needle vavle, the needle valve is so you can get an accurate bubble per second rate, a bubble counter is used for this. If you still want to use disposable bottles this link is cheaper than machine mart for the reg, needle valve still needs to be purchased.
Cheers Gordon
EDIT i use a fire extinguisher as a lot of people on this forum does with no problems
Just have a read of the link i posted above which is this, its every thing you need to know about using a fire extinguisher, just keep the bottle upright when in use, and be careful not to knock it over.
The trouble with those £4.99 refills is the £11.00 postage, but I guess that's still only £15 for 3 refills which is cheaper than here or about the same
I'm not sure on that regulator you posted, from what I've seen most people seem to use the regulators with two gauges - I guess this tells you how much CO2 is left as well as the pressure of what you're putting out, that single one will only tell you one of the two (not sure which )