from: http://www.i10.org.uk/powered_by_drupal
We choose Drupal because it offers a huge range of features which can be layered on top of a robust user and content management system. It is extensible and scalable yet rigorously maintained by a vigorous developer community.

As a result of building this site, i10 will be able to contribute several feature enhancements back to Drupal. These new features were built by Code Positive Ltd who not only work Drupal magic, but provide sound advice, guidance and experience in equal measure.