Managed to find a freshly refurbished Class 455/7 unit on the 1752 Waterloo-Weybridge via Hounslow. Here is the interior of the MSO vehicle. Unfortunately I didn't manage to identify the unit number.

Apart from the external repaint the following appears to have also been done:
Some seat cushions replaced.
Handrails, window surrounds and heater covers repainted.
New chrome strip below the windows.
The old now-discontinued T12 fluorescent tubes replaced by T8 ones

However:
Flooring has not been touched.
No changes to door sounders at this stage.

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Make:	NIKON
Model:	COOLPIX S3100
Exposure:	0.033 sec (1/30)
Aperture:	f/3.2
ISO Speed:	400
Focal Length:	4.6 mm