I am currently in the second year of welbeck as an army student and I also want to join the signals. Regardless of what corps you are wishing to join, the same standard is expected of all officers joining the army. So whether you want to be a paratrooper or a chef, the initial tests are the same. At the army officer selection board the most important advice is to be yourself, you don't have to be particularly fit or sporty, you don't have to be big, it's about the person you are and your leadership potential. They aren't looking for officers at this stage, they're looking for individuals with the right qualities to be moulded into an officer.
Anyone thinking of going to Welbeck, make sure this really is the career you want. Once you enter the dtus scheme, there isn't much going back. It's a big commitment to be made at such a young age. Welbeck is not 'the army', its a sixth form college with a strong focus on academics. It takes two years of hard work and another three or four years at university before you will even begin officer training. If anyone has any questions about the college or the career, message me.