The "Ring Burner" I use (yes, a very apt name isn't it!

) is the "RB30 triple ring burner" made in China (surprise, surprise) and is supplied by a company called "Companion". It runs off LPG/propane/natural gas and provides more than enough heat (i.e. about 30 MJ/h or about 8kW) for cooking curries using a 32cm wok/pan.
The smaller double ring burner (20MJ/h or about 5.5kW) would probably be suitable for smaller woks/pans (less than about 30cm) whilst the quad ring burner (59MJ/h or about 16kW) would probably be suitable for larger woks/pans (greater than about 34cm)
I've attached a specification sheet for these products at the bottom of this post.
I did email Companion but I didn't receive a reply :

. Here's a copy of my email to them:
"Dear Sir/Madam,
I am a member of a UK curry cooking forum, though I am currently living in Australia. I use one of your triple LPG burner rings.
Others (in the UK) are interested in buying them. Please could you tell me who might sell them in the UK?
Otherwise please would you tell me:
- if you would export them and, if so, at what cost (for your range of ring burners)?
- if you would sell them to me, with volume discount? If so, what volumes and what discount?
Thankyou for your assistance"
They DID have a web site
http://www.companion.net.au but it no longer seems to be functioning

Maybe someone might be interested in trying to source them in the UK? I can always ship some over to those that might be interested (but the freight will probably cost a fair bit because they are very heavy!)
