I specialise in The Avengers items. There are several different Bentleys that Corgi produced and look very similar but, thankfully, just the one Lotus Elan. Having said that, Emma Peel had a blue Elan S3 most of the time, the white one just featuring in the first black and white TV series. So I can provide a green Bentley (Steed never drove a red one!) And a choice of blue or white Elan with correct registrations.
I also supply Corgi GS40 gift sets with original cars and sometimes have original characters too.
Although not a Corgi model, there is a marvellous Elan in the correct scale and finish made by Vitesse that I can include in a set or supply individually.
I am always happy to supply to individual requirements (although currently Elan stocks are low and good ones hard to find!)