"Suburban" Class 455 unit on the Waterloo-Waterloo via Hounslow "loop" service. Most services on weekdays use a Class 450 Desiro but weekends sees these used as much as possible, especially as all services are usually 4 car all day. As platforms at Virginia Water and Chertsey are too short, 8 car 455s are not permitted to open doors there as there is no Selective Door Opening system fitted. The Class 450s have also required a derogation from the Rail Safety & Standards Board as SDO systems that are manually set are usually not permitted, and an auto system using track-side sensors (called a balise) provides the train with information on how many doors to open.

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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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Refurbished units 5714 and 5904 both make up the rear half of their respective trains:
5714 on the 1909 Guildford via Epsom
5904 on the 1906 Hampton Court

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Another one of the refurbished ones.

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