A frame for a trading desk is made up of two end frames arranged to extend vertically in use. Between those end frames there is a main support beam structure which may include a pair of main structural beams for example. The main support beam may be extended from a lower part of the end frames, close to the floor and provides the main structural rigidity of the desk. A computer trolley is provided which supports computers just above the main support beam and has a channel arranged to receive the main support beam.