XR 6056HomeRX 6180
3 Litre Bentley from 1925

The car was spotted on the parade of the London Lord Mayor's Show 2011.

And it was spotted in France in 2012.at the 46ème Rallye Paris - Deauville. And this is a very nice information, as John Steed spent his holiday in Deauville in Spring 1963 (The Nutshell).

Photostream with several photos on Flickr from the Ralley 2014

Vintage Bentley states the delivery date for July 1925, according to Vanden Plas the car was originally fitted with Body No. 1163 with a Sporting four-seater.
YK 6871

3 litre Bentley

Green Label,
Four Seater, chassis by Vanden Plas

License Plate: YK 6871

Chassis no.: 1102
Engine no: 1122
(engine no. in 2016: ML 1521)

first registered: May 1925
Delivery: July 1925
First Owner: R. Miesegaes

Steed's Bentleys
Series 5

The Fear Merchants

The car has only one appearance in The Avengers.
The website VintageBentleys.org added two newer photos of the car from the 2014 rally Paris - Deauville (a town well known to John Steed as he mentioned it in The Nutshell).