Coming home on the train the other day, I noticed a lot of work
beginning already on construction of the East London Line extension at
Silwood.

My question is, the construction I noted was all by Somerfield Street
(he http://www.streetmap.co.uk/streetmap...178366&A=Y&Z=1
). I thought this was going to be the path of phase 2 of the southern
extension to Clapham Junction, and that this wasn't due to be started
until phase 1 was completed.

Anyone know what's going on here?

Patrick