It is not often that a firm gets a chance do a makeover of one of their masterpieces.

The major design decision taken was to organise the offices around three atria. This required three 20x20 metre bays to be jacked up by a metre to create two storey accommodation.

This is a project that has rescued an important example of mid-century modernism and answers questions about how best and most economically we can re-use under-performing and outmoded structures, rather than building from scratch.