Hi Martin,
First of, you can safely read the Charlton as 9,800,000 to 9,999,999 for an insert range of 200K.
(I seriously doubt that the last brick in the run was issued as regular notes.)
Second, since you note ends with a number between 500 and 999, check if it is a missing circle note. If it is, it may be worth keeping regardless of its condition.
JWS