3230 was indeed the first rear engined bus in the fleet, but was registered (by Leyland Motors, who owned it as a demonstrator) 460 MTE. BCT later bought it, but sadly it has gone the way of many others and is paperclips and drink cans now.
The first Daimler Fleetline was going to be 3229 (3229 VP) but Daimler kept it as a demonstrator and registered it 7000HP. It was eventually sold to Blue Bus Services of Willington, Derbyshire, and was lost with most of their fleet in a garage fire. The number 3229 VP ended up on a tractor in the parks department, I believe. Fleet number 3229 was unused, but may have been temporarily issued to (but not carried on) AEC Bridgemaster demonstrator 2211 MK.
My memory must be playing tricks on me with the Atlantean's registration,
but I well remember seeing it on the 11 route near where I lived at Stechford, and that massive logo. I also remember Crossley Bridgemaster (9 JML) and as a schoolboy enthusiast was treated to sit in the cab by one of the drivers in Lea Hall Garage. I suppose that went the same way as the Atlantean! Happy days.
Dave