Hi astro, xxx

I have to have my whites white cannot stand them looking grey.

Been years and years since I had a hot and cold fill. I have had Hoover's most of the time, got an indicet at the moment.  I have never done my whites on hotter than 40c but never put colours of any kind in, only whites together.  I have never had problems  with not getting them white enough.  

I really wouldn't know about boiling the kettle costing more, how would you work something like that out?

I wouldn't trust myself with a boiling kettle lol.