A user control interface (1), the interface comprising a host module (2) and a first user module (3), the first user module arranged to provide to the user at least one input and/or output functionality in relation to equipment external to the interface, the host module and the first user module are operatively detachably connectable, and the first user module arranged to allow a second user module (4) to be operatively connected thereto, the first module arranged to provide signal communication between the host module and the second user module, and the host module arranged to provide a connection for enabling communication externally of the interface.
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