Arwel has been headteacher of Brentside High School in Ealing since 2003 and has overseen a significant increase in examination outcomes at the school. Brentside joined Challenge Partners in 2011 (Lampton hub) and Arwel is a member of the hub steering group. As a serving LLE he currently works with the London Leadership Strategy supporting schools in Somerset as part of the 'Somerset Challenge'. He also supported another Ealing school as Executive Headteacher for five terms after Ofsted had placed the school in special measures (the school is now 'Good').
In 2010 Arwel was the Teaching Awards secondary headteacher of the year for London and South East.