How is progress on this going - I've never seen much evidence of it around though there have been whispers of bits being installed on the Hammersmith branch. Presumably no wiring to get in the way like the Northern or Jub.
No local SER's have been fully built yet they have been doing some groundwork for the posts for the antennas it will be Hammersmith H&C getting it first. 4LM are still doing survey works especially on the Met line now the District and Circle I believe is all done now. Once SMA 0.5 is installed every approx 2 months a new area will be fitted out then testing and commissioning will start.