This paper introduces the design and implementation of a 1.25 Gbit/s indoor cellular optical wireless communications system. This forms part of a European community funded project on Home Access Networks (OMEGA). The system includes multiple communications cells with the capability of fast handover to provide seamless communications suitable for in-home use. In this paper we report a demonstration of a bi-directional 1.25 Gbit/s system which can operate up to 4m without error under normal off...