Thanks for the heads up - Adams Gas quote £86 for deposit and refill for 6.35kg beverage co2, then £24 a refill, so I would presume the original deposit is circa £60 (matches up roughly with your figures from march 10th)Try Adams gas... they have independent suppliers all over the place.
(My local car motor parts factor turned out to be an Adams agent.)
I'm intrigued to know what your planning Pete...Hi XOZZX,
I might end up going down the same road as you. But as I have not yet bought any CO2 equipment apart from the refillable bottle that screws onto the top of my King Kegs, now is a good time to experiment with a non CO2 system that hopefully will only cost me £15 to put together and free gas for life.
Just an experiment, but I'm confident it will work. Photos & report to follow if Ebay/Post Office ever get their act together and deliver my valves!