OOPS!

 A successful test is one which identifies problems to be fixed.  I have had a successful test!

The burner has been fitted, and electrical connections seem to be good.  

I then decided to put water in the water tanks and test for leaks.  This test was the 'successful' one, giving me the opportunity to emulate Noah.  A long time ago, I assembled the parts, but did not go on to seal the joints properly - after the test I am having to dismantle and then re-assemble the leaky joints properly.  Working on plumbing in situ is more difficult than doing the same job on the work bench. 

I am also trying to work out how to use the additives which will:

• prevent 'diesel bug'  and 
• keep the boiler clean.

Does it reflect on the steaming community that the correct concentration of water additives are described such that the water has the appearance of bitter when correct, whereas the appearance as of Guinness or lager indicates that the additive is too strong or too weak.