BDB Pitmans has a large parliamentary agency practice which operates across the areas of infrastructure promotion, private bills and pure parliamentary work. The team specialises in CSR and work connected to charities, including sustainability matters. The team is led by planning specialist Mark Challis, who works alongside parliamentary agent Nick Evans, who advises promoters of major infrastructure schemes, promoting private bills and petitioning against hybrid bills. Angus Walker provides advice to promoters of development consent orders, while Sarah Clark specialises in infrastructure promotion, including schemes for Highways England, TfL and Network Rail. Duncan O'Connor joined from Pinsent Masons LLP in December 2021.

Pinsent Masons LLP handles work relating to private (local) bills, Harbours Act orders and Transport and Works Act orders, all with a particular focus on planning and consenting economic and transport infrastructure. Practice head Robbie Owen is an experienced Roll A parliamentary agent, and prominently works with county councils on expanding transport links. Francis Tyrrell handles bills related to pension schemes as well as harbour work including reclaiming land. Associate George Wilson has been advising TfL on the Crossrail Act 2008 in relation to the construction of the Elizabeth Line.

Sharpe Pritchard LLP advises a range of trusts and non-profits with a focus on matters related to land impacted by the development of transport infrastructure. A particular area of expertise is the impact of HS2 on historic sites and significant landowners, as well as the development of nuclear power stations. The team is led by Alastair Lewis, who represents landowners and churchwardens, advising on their objections to HS2 Phase 2A and securing mitigation for these clients. He is a Roll A Parlimentary Agent, as is Emyr Thomas, who advises The National Trust. Aidan Dickinson focuses on real estate work and heads the compulsory purchase team.

Winckworth Sherwood LLP drafts and promotes legislation, statutory instruments and byelaws in the Westminster parliament, with a specialist focus on major infrastructure projects of strategic importance. The practice is led by Paul Irving, who has led on work for the Department of Transport as well as schemes and legislation related to British ports. Hazel Anderson has a focus on rail and harbour clients, with work including environmental impact assessments and habitats issues. Alex Dillistone negotiates complex legal agreements with a range of organisations with objections to HS2 and National Rail projects. Jane Wakeham works across the practice on matters including hybrid and private bills, development consent orders and Transport and Works Act orders. The hugely experienced Alison Gorlov has stepped down as a partner and now acts as a consulting Parliamentary Agent for the firm.