Another novel solution to running Windows applications when you are primarily Mac based - simply borrow someone else's computer. Only this computer was located in America, and I was in the UK.
The solution lies in using Amazon's suite of web services, appropriately enough called "Amazon Web Services". By loosely following this guide, I was able to boot a Windows 2008 server, remotely connect to it using CoRD, carry out the work I needed to do and then return the server resources to the cloud, for others to make use of.
A quick calculation suggests that typical running costs could be as low as 20p a day, or one pound a week, and I have no extra hardware to look after. A very cost effective solution for small jobs, or one-off tasks.