If you've got a head for numbers then this was the week for you. Working with accountancy firm Smith & Williamson, Legal Week has produced what we like to think is one of the most detailed views available of the performance of the UK's largest law firms. We are not just talking about headline figures like revenue and profit per equity partner (PEP) here – this gets down to the real nitty-gritty of how these businesses are run.

The main analysis provides detail on areas such as how much each member of staff costs the firm and how much each lawyer generates, while our special focus on debt reveals which firms have come out of the red.

The continuing fascination with PEP is discussed in this article, while Smith & Williamson's head of professional practices, Giles Murphy, also offers some thoughts on the matter, as well as his picks of the firms performing more efficiently than their rivals.

Sticking with the numbers theme, the 2014-15 financials are continuing to filter in with firms including Fieldfisher, Taylor Wessing and Bond Dickinson announcing their results this week. And the magic circle's battle for associates' affections continues, with Clifford Chance becoming the latest to announce its salary rates.