The V module is an arm unit that you can attach to any of the seat units.
Best Price: £441.70 from Darlings of Chelsea
The F module is a chaise unit that can be combined with any of the other seat units.
The C module in a corner unit that can be used to create a corner sofa when combined with the A modules.
The Y2 module is a curved end unit that can be combined with any of the other seat units and works well with the curved footstool (WL).