Class 442s Still not in service? and why have only a handful of trains been painted?

Hey Guys, I have noticed most of SWRs Fleet still retains the SWT Livery, excluding the 455,456 and 458 does anyone know why the refurbishment of the Class 450, 158,159 and 444 is taking so long? Also on this topic why have the Class 442s not entered service yet? I thought they were due to enter service 2 months ago?