I chanced upon Jawel-sales (eBay id), who has a chain of suppliers in the Midlands on automotive goods. They also do MIG shielding gas, using old fire extinguisher bottles (as far as I can make out from the letter stamps):
Pure Argon:
£58 + vat outright purchase of bottle
£28 + vat replacement gas
Argon mix
Same as for Argon
CO2
About £35 outright purchase of bottle and gas
About £18 refill.
You buy the bottle outright, and on refill you exchange it with a full one. Steve the chap at the counter is very helpful. He confirms that even if you buy argon mix to start off with, you can replace that with argon as long as you ask them beforehand. Wow, I bought two of these on the spot!
teddykan
Pure Argon:
£58 + vat outright purchase of bottle
£28 + vat replacement gas
Argon mix
Same as for Argon
CO2
About £35 outright purchase of bottle and gas
About £18 refill.
You buy the bottle outright, and on refill you exchange it with a full one. Steve the chap at the counter is very helpful. He confirms that even if you buy argon mix to start off with, you can replace that with argon as long as you ask them beforehand. Wow, I bought two of these on the spot!
teddykan