(15 Sep 2013, 2:04 pm)Terence Price wrote Any idea how many Plug Socket 158 Classes Arriva currently have? they only seem to show up if your lucky...

I believe only 24 - these are the examples that have been completely refurbished also... See here for details on refurbishment.

As part of the same upgrade, 27 class 175 trains were upgraded - as were 8 single carriage class 153 trains.
This work started in the back end of 2010, and was completed by summer 2012.