I should say still one tiny drip. I had a bit of a leak in the union at the bottom of the reactor, where I had basically over tightened the compression fitting. That is where it looks as though it is coming from now. It's suprising how much will come out of a tiny weep in a few hours.
I also had a pin hole in the solder on the heater flange, so had to basically resolder the whole thing. Glad I did it really, coz I've got a lot more solder on it now.
Just demething now, using the diffuser in the heating tank. Far from ideal, but judging by the smell coming off, it must be doing something.