It seems that right now there aren't very many Microsoft APIs job opportunities in North London. Why not have a look at vacancies in similar areas of expertise? .NET Framework and Microsoft Development Tools job opportunities as the main columns will yield many vacancies to those right now seeking a new challenge. You should be familiar with areas of expertise like .Net, ASP.NET, and Wpf - they are very commonly mentioned in job offers.
It's a junior candidates market right now, with 3 of available Microsoft APIs job opportunities seeking candidates who can learn on the job! Take note that there are right now no internship positions on offer in this area. In this area, most employers publishing vacancies are larger outfits. However, one startup is also in the ring. Recruiters currently represent many of the employers searching for talent in this market. If you'd rather not see vacancies posted by personnel agencies for a while, you can filter your Jobfeed as and when you wish. While you're here, you can check out interesting information like recruiting trends, and see the quantity of vacancies on offer.