OK so which is it BC6813
Your thread title above states one model but you specify another in the first post.
Thus far I cannot find in all my CTV data, any reference to a Bush BC6813 or BC6183. Are you sure this is the correct model ID? Do you have a picture?
I started at 1973 and went forward to 1981, I thought BC designations came in the Mid 70's prior to that it was CTVxxxxCould it be a BC6318?
With your mix up with models numbers its worth mentioning, if so that would make it a 1976 A823B
I'll keep looking but a picture and confirmation of the correct model would help in the search.
Prior to 1974 numbers were CTVxxxx So from 1975 - 1981 below is what I have found in my library and consulting Radio & Television. I will check my BUSH cabinet but I don't think there is anything additional to add.1975/1976
BC6318, BC6415, BC6416, BC6418 =A823B Chassis1975/1976
BC6401 = Z179 Chassis1976/1977
BC6100, BC6111, BC6200, BC6300, BC6338, BC6437, BC6438 = Z718 Chassis1977/1978
BC6004 = 14" Chassis1977/1978
BC6140 = Z718 Chassis1978/1979
BC6240, BC6248, BC6340, BC6348, BC6448 = T20/T20A1980/1981
BC7300 = T26A Chassis1980/1981
BC6268, BC6368, BC6468 = T22A Chassis
That's it after that the number go BMEdit
: I see this is about the set that is for sale on e-bay in Southampton? Its being discussed here
and you confirm it is indeed a BC6813 but it would help if you could be sure