I don't know that not applying a code for the bonding issue is acceptable.
Yes the connection should be as close as is reasonably practicable to the point of entry, and it may be that 1500mm is as close as resonably practicable, it may be that the pipework betwen the point of entry and where the connection has been made is inaccesssible.
However the fact that there is a Tee junction between the point of entry and where the connection hass been made, suggests that the pipework is accessible (otherwise there wouldn't be a Tee junction), so the point of connection has not been made as near as practicable to the point of entry.
It is also a requirement that the bonding be connected before any branch pipework, which clearly in this instance is not the case.
To my mind, without further information with regards to just how accessible pipework is, I would apply a code, C3.
As for the ceiling rose, I'm not quite sure what the OP is stating.
What is the 'back plate' referred to?
Is the rose incomplete, just the cover hiding some terminal blocks masticed to the wooden ceiling?
Or is it complete (back plate and cover), and screwed directly to the wooden ceiling?
In the first instance, yes I would apply a code, either CÂŁ or C2.
In the second instance, I wouldn't apply any code.