Thanks everyone, seems I win
- you are right it is DH who us the OTT water measurer - prize for guessing that is
& 
Though you are also right, I shouldn't have used OCD, I know RL sufferers, so that was flippant of me
- late & chronic migraine flare up, so brain not fully in gear! apologies if it offended anyone.
Though this has got worse of late & I do worry about him as I know he's very stressed & I've seen him really get to the point of OCD behaviour with water in the past when he wasn't coping - redundancy looming & he's been worked into the ground for a long time now & they are stringing him along like you wouldn't believe, personally I would have told them to stick it by now, as in the current situation, they need him, way more than he does them, yet they still take the pee, but he's not as confident as me with stuff like that :(
To the couple of posters who seem intent on sticking the knife in, for no other reason, than they are hiding behind a screen & they can - Not an argument, please read the OP properly
- I used the word debate & I'm pretty sure everyone else got that it's with tongue firmly in cheek, so wind your neck in please, or maybe take up boxing or something to work off that aggression or perhaps get a life 
He puts the kettle on & I make a drink for us - so yes it winds me up, especially at night, when I'm feeling ill & ready for bed & as some of you so rightly say, with hard water, steam & also not allowing for coffee grounds - I then have to boil more soddin water to actually have enough, so his idea that it's water/money saving is plain bollocks
but he's having none of it, hence why I posted - but hardly a row & I'm not planning to LTB, amazed anyone would think otherwise from my OP 
For those that ask - kettle is a retro styled one, you know, the big chrome dome type things, with arced Bakelite type black handle, which is how we like it - so no water gauge, but even I, who does suffer with spacial awareness trouble at times, can manage to fill it without using a mug & still be reasonably accurate & boil what we need, rather than try & be too clever, waste time & not boil enough
He was so adamant that he was right though, he was definitely having a cocky git moment! even suggesting you would all agree
so I shall look forward to showing him this when he gets in later :)
Those that ask, why make the coffee the night before - you are right, wouldn't be my choice either, I like it freshly brewed - but he has a very early work start & thinks just pouring a ready made cold cup of fresh coffee & microwaving it saves him time - daft IMHO, but his own morning routine, so that's up to him.
Thanks again 