Refillable Gas bottles and brands

There's an increasing interest in the virtues and uses of refillable gas bottles now that fuel stations have been officially told that they're not allowed to turn approved brands away. Obviously these are not for all, so I'm not inviting posts about people's own reasons for using or not using these things in general, but more specific up to date information, please:

Discussions here are dominated by Safefill. I know of Gaslow but get the impression that's only for more built-in systems, usually in MH's, and we're currently using the old style bottles strapped into the caravan front locker.

Are there now other useful brands of bottles to be taken out of caravan lockers and refilled, or is Safefill The One True Way?

Thanks