Few recommendations on the option above:-
The entrance door to be the opposite way round (as its currently installed on the photographs). When you come up the stairs and open the door you want to see straight through into the showroom then you don't have to walk around the door to get in. Think it would give a better open feel as you enter.
Solid wall behind seats so you cant see into the boardroom but have a glass wall to the showroom. Ayrtek logo could be etched into the glass.
Don't like the fact that you have an open plan showroom and boardroom area. Could you not construct a glass wall on the open side so if your having a meeting you could still have an assistant seeing to another potential customer in the showroom? Even if its visit by appointment only, would still prefer a more enclosed/private boardroom. However, once the office location becomes known to many I'm sure people would want to just turn up which could increase sales?
Boardroom could be made slightly longer but have the far end of the desk against the wall, (less chairs) but you could have a large TV on the wall here to show presentations?
Seems to be a lot of wasted space in the corner behind the desk. I was thinking more of a large corner desk to maximize space but to also give a large desk/counter for computer etc.
The small square space in the showroom area could have a curtain screen, then you could have multiple shelves behind to use as storage space as you don't seem to have any.
Just a few pointers that I thought of.