channel allocations but at an interim ERP of 5 W each until the rest of the area performed its digital switchover four years later. BBC Two Wales continued as an analogue service (but was moved to S4C's old allocation of channel 31). It appears that the decision to allocate BBC Mux B to channel 27 was a late change, forcing a variation of licence to be agreed with OFCOM. Digital television 19 August 2009 - 16 September 2009 Analogue BBC Two Wales was finally switched off in August 2009 because digital switchover had commenced at the parent transmitter at Preseli and that was the first analogue channel to be shut down there. The new BBC A multiplex started from Preseli and took over the channel allocation previously used by the "BBC Mux 1" multiplex, using 64-QAM modulation and with its full post-DSO power level of 25 W. Unusually, at Ferryside, the final ERP chosen for the digital multiplexes was actually higher than has previously been used for analogue TV. 16 September 2009 - Present With the completion of DSO at Preseli, the new digital multiplexes took over at Ferryside at their full post-DSO ERPs. Almost uniquely, Ferryside radiates four multiplexes. † Some disagreement as to whether this service is 5 W or 25 W. It is usual practice for Digital 3&4 to be radiated with the same ERP as is used for the BBC multiplexes. OFCOM's own post-DSO documentation does agree with the table shown above however. References External links Ferryside's entry at mb21 UKFree's entry for the Ferryside Relay Transmitter sites in Wales