After sending in a CV and cover letter, They invited me in for a face to face interview the following week.
The interview consisted of 2 parts: A more general standard interview type part with 2 of the more senior members of the studio (why do you want this job, what motivates you etc.), and a technical part with one of the senior programmers, who asked me technical questions about C# (what is inheritance, what is polymorphism , what is encapsulation etc.) and parts of the .Net framework e.g, LINQ. The interview lasted just over 2 hours.
They seemed genuinely very passionate about making games and had clearly made an effort to look through the portfolio i sent in with my application, and generally seemed a friendly bunch of people.