Well, it doesn't really matter what time I email them because I'm not worried about speed of response, I'm annoyed about not getting a response at all.
Turns out that what I originally got from Holan was about 60% of the fitting bits I needed, and of that 60% about half are the wrong size. I did eventually get a picture with some labels on it from Holan but only for the upper bars, and the parts they did send don't match up; for example the diagram says "here is a 100mm M8 bolt" and I got a 120mm bolt which means I have to buy another or find a spacer somewhere. Also, I don't trust the diagram because it's full of flaws, like "here is a 30mm M8 + M6 nut + M6 washer" etc. So this actually gave me more issues than it solved.
I just spent a whole day and a half driving around trying to find bolts, nuts and washers of the right sizes (which believe me, is extremely difficult considering there are no instructions, so I have no idea what parts go where) and tried to fit the bars.
Let me remind you all how frustrating it is to assemble something (which is a very awkward shape, may I add) and then realise something doesn't fit and have to disassemble the whole thing. I'm sure you've all been there. Hours wasted.
Furthermore, I'll inform you all that the upper bars do not fit with the Honda OEM wind deflectors (worth £120 for the pair), so I had to rip those off and the bike looks like poop now with 3 holes and glue residue on each side. Now I have two wind deflectors I can't use if anybody's interested..
And in response to your suggestion, I considered linking Holan to this thread, but thought that considering they're not replying, they either A) don't even read my mails or B) Are intentionally avoiding helping me anyway, so them seeing this won't want them to help me any more.
I absolutely wish I went with Hepco. DO NOT BUY HOLAN. EVER.