This won't be in everyone's interest but a very good offer for people who are into the whole Windows 8 app development or HTML5 with JS/CSS3 in general.
Use code : HTMLJMP for a free exam credit and there're plenty exam venues to choose across the UK, the exam will normally cost £99.
After passing 70-480, you will be given a certification for Microsoft Specialist and this is one of the three exams which will ultimately certify you as MCSD (Microsoft Certified Solution Developer). MCSD is one tier above MCSA (Associate) and is a respectable title in the field of web development.
Exam registration: http://www.microsoft.com/learning/en/us/exam.aspx?id=70-480
Link for free online training: https://www.microsoftvirtualacademy.com/tracks/developing-html5-apps-jump-start?o=1943
Link to MCSD page: http://www.microsoft.com/learning/en/us/certification/mcsd.aspx
This offer is available for a limited time only..
Edit: It seems the old code is now expired , try 'HTMLMPN' instead (credit to Raspberry and gowthamj)