Just had a reply from Paul over in another area.
And the last part really caught my eye.
The water bye-laws banned them some years ago due to the possibility of back-siphonage, but there must be many still in use.
That's a really good point Paul, even after anything is deemed unsafe or not good, things like these can hang around in places for years after the fact!.
There are thousands of Transformers here that are full of Askerels and PCB's, but they still work, so who cares?.
We are to a certain extent still getting rid of Lead pipes in houses here and also although it was banned years ago, lead flashing still seals God knows how many houses, up until a few years back some of these houses used to drink the run-off from the roofs!.
It's all one big mess, ban it and watch it disappear instantly, eh?.