I received an email yesterday asking me to take the online assessment, i did that and within about 1 hour i got a reply asking me to go to fareham within the next few weeks to sit an assessment, along with that they sent links to information that they expect you to read and learn for that assessment, there is a 22 page guide telling you all about NATs, ATC, and aircraft, which apparantly will be on the assessment, along with a spatial reasoning question and some other bits and bobs