The Westgastransport Extension was built primarily to take gas from Markham to shore. Production from the K/4a, K/4b-K/5a, K/5b and Windermere developments was tied in during the late 1990s. In March 2002, production from the K/1-A field (partly on the J/3a licence) was tied in. The UK fields Grove, Chiswick and Stamford began exporting via the pipeline in May 2007, October 2007 and December 2008, respectively. The pipeline connects to the main WGT system at the K/13 production platform.