Diligenta, TCS's UK FCA-regulated subsidiary, was established in 2005 to specialise in business process outsourcing services for the UK Life and Pensions industry

With its head office in Peterborough, Diligenta has offices in Liverpool, Basingstoke, Bournemouth, Bristol, Exeter, Salisbury and Dorking.

Diligenta entered the UK Life and Pensions marketplace in 2006 by securing a £486 million deal with the Phoenix Group (formerly known as the Pearl Group). Offering a full BPO, including the administration of 3.6 million policies, Diligenta provides a number of the Phoenix Group companies with call centre, back office administration, IT, HR, finance and accounting services.

In January 2008, Diligenta secured its second client when it won a contract to deliver BPO services to Sun Life Financial of Canada's UK operations (SLF UK). The services, which commenced in May 2008, will be worth more than £100 million over the life of the contract and involves administering a further 500,000 life and pensions policies.

In September 2010, Diligenta extended its relationship with the Phoenix Group when it took on the administration of a further 1.7 million policies.

On November 9, 2011, Diligenta announced a major new deal with Friends Life, following an agreement to assume the responsibility for the administration of 3.2 million of their policies. The agreement, effective March 1, 2012, is worth £1.37 billion over a term of 15 years.

This major deal underpins Diligenta’s position in the UK Life and Pensions BPO market place and takes the number of policies Diligenta now administers to just under 8 million.