The 10 year olds were tried at The Old Bailey Richard!

'There is no other legal or social arena where we give children complete responsibility at 10, mostly for good reason.

Other countries with a very low age (10 or less) usually have a period where responsibility is not absolute until mid-to late teens, or where the response to breaking the law is welfare-oriented rather than retributive.
For example, the age in Scotland is eight but the consequences are almost all framed within the welfare system'

From a Guardian article in June 2001 reporting on the Bulger case

N.B. since then the age at which children can be held criminally responsible in Scotland has been raised to 12 to bring Scotland into line with most of Europe.

What retribution would you suggest in this case Richard?