A local data provision system comprising: a plurality of transmitters each
located at a respective entity having a limited range of physical
utility, and each transmitter being arranged repeatedly or on demand to
transmit wirelessly a signal carrying data indicating the presence of the
respective entity over a range substantially coterminous with the range
of utility of that entity; and a personal information unit comprising a
user interface for signaling information to a user and a receiver
arranged to receive the availability data and to cause the user interface
to signal information to the user in dependence on the received
availability data.