I had a spare moment today and decided to get my cylinders filled so they're ready if the weather ever improves.
expected to wait a while (for Nitrox) as I hadn't bled them off since the last time we went out.
Found that when I got there they've had a booster pump installed and what looks like a new bank and are now also supplying helium (one of the analox helium analysers in use as well) The charges are based on per liter.
Don't know what the per liter charge is as I didn't ask but I'm sure they'll let you know if you give them a call.
Ian.