Traders insist on having a written contract for leasing their spaces from Truman Brewery

As traders in the vintage market on Brick Lane, we have no work or rent security and for the last 10 years we have been denied the request of a contract to rent the space from Truman Brewery. We now all pay a substantial amount every month and demand security in the form of a contract. We cannot accept random 6 month rent increases, or agree to sharing our only entrance whenever someone rents the room upstairs.