The business transformation and technology programme has cost about £60m, involved 40 projects and the introduction of 12 new systems, including customer relationship management, imaging and workflow.
Britannia has replaced its data archiving system with a Linux-based system. The archiving system, which holds customers' mortgage and savings account details, uses an Oracle 9i database running on Intel-based servers using a Linux operating system.
"It was a good opportunity to pilot Linux as it is a relatively low-risk system and the service level agreements are not too demanding," said Mark Jacot, information services manager at Britannia. "We also want to evaluate the support contract."
Britannia would consider using Linux elsewhere in the business, depending on its performance in the archiving system, he added.
Britannia has replaced its systems with IBM Integrator and Websphere middleware. When the new systems are integrated, Britannia will have a real-time view of its one million customers.
The programme was built on an earlier Y2K project to update Britannia's PC network and included the introduction of system management software.