Cabmont?

Hello to you All,
I’ve copied this photo my brother had in his archive and I think it could be something to do with Cables Montague or Cabmont.It was taken by the “Cutty Sark”,sadly I don’t know the date.Hopefully a member of the forum or an old driver might recognise it and tell us. It had just been delivered from Nightingale Engineering of Balham,SW London, who were agents for selling Atkinsons. Regards,900X20.