Campaigners from Leighton Buzzard are staging a protest in London this lunchtime over plans to build an out-of-town retail park on land owned by the Church of England.
Residents and traders gathered in Bedfordshire this morning before heading to Westminster Abbey.
They claim the development on Grovebury Road will take trade away from the town centre.
Protester Victoria Harvey said the town council, community and local market traders were all against the plans.
But Central Bedfordshire Council, the Church Commissioners and the developers say it will create jobs and attract people to the town.