Then consider office tech support, which is on your list. That's
something you can't really do remotely and part-time. If something
goes wrong, you need to be there to fix it. With a rapidly growing
office, that's going to take up a significant amount of time as well.
(It's probably half a day's work just to set up each new staff
member.)

True, some aspects are hard to handle remotely. But, again, this gives us a tech resource to draw on and helps justify FTE in 2014.

Realistically speaking; if you're paying £35K for a developer/manager (which is what the last job description was looking for) it's not a great use of his or her time to be fixing laptops :) If this is a major issue there are contract tech support services we could look into to fill this specific gap that would be more cost effective.
  

In fact; mulling on this specific point... I think this is the approach to take for tech support in the office. Either contract it to a local firm (as it's not something likely to demand days each week) or hire someone part time - a student for example. 

It doesn't require exemplary technical skills, and is the prime opportunity to offer a "first job" to someone.

Tom