It doesn't matter what happens in other countries, in the UK Jim's advice to buy the approved kit is the only sensible approach.
The point I was making was that there are alternatives to the UK system, which in my view is one that only benefits the company involved. Of course like any tool you need to know how to use it safely and effectively.
So yes if you don't understand the principles and know how to implement them stick with the safe and simple alternative. I have a fixed tank and with adapters its simple to fill up all over Europe.