The review, which was conducted by COI Communications to prepare the business community for changes to the service, saw DLKW go head-to-head with HHCL/Red Cell after the incumbent agency, Miles Calcraft Briginshaw Duffy, was dropped from the pitch at an earlier stage.
Media planning and buying, which are handled by PHD, were unaffected by the pitch.
The pitch was held as the DTI prepares to relaunch the Business Link service, which aims to promote the interests of small UK businesses and offer advice to them on issues including investment, taxes, payroll and employment law.
Business Link was launched in 2002 with a TV campaign by MCBD, in which children offered nonsensical advice on how to run a small company.
The pitch saw work from both HHCL/Red Cell and DLKW go into research at Cragg Ross Dawson before a decision was made.
DLKW, HHCL/Red Cell and MCBD were all recently reappointed to the COI Communications roster.
Neither COI nor DLKW were available to comment on the appointment.