on UK Free TVThe advert states that the services may start very soon:
BBC MAKES AVAILABLE CAPACITY ON DTT MULTIPLEX B
The BBC is offering to the market an amount of spare digital terrestrial television capacity on Multiplex B which could enable the acquiring party (or parties) to launch TV channels as early as spring 2013. Channels carried within this capacity will be able to be watched on all Freeview HD and You View receivers.
The capacity will be available on a 24 hour 7 day a week basis and is suitable for either one high definition television channel one provider or up to three standard definition television channels which may come from either one or a number of different channel providers.
The capacity is being offered to the market through a competitive bidding process.
If your company is interested in part or all of the capacity, you can register your interest by email at dttcapacity@bbc.co.uk
Expressions of interest must be received by 5pm on 20th December 2012. Further information, including commercial and technical details about the capacity and the sales process, will then be sent to you.

Which channel should be added to Freeview HD?