So the murder is solved and the kid is hiding on the armory and finds the Military Cross that everyone is looking for stuck between two bricks. It looks like 'For Bolle' is scratched on the back on top of Deverson's engraved name. Who put the medal there? (No one in the episode owned up.) And what is the significance of the scratched words? TIA.
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It said "For Ollie", so I'm pretty sure Deverson felt guilty keeping it knowing that he got Ollie killed.
shareNo, Deverson didn't feel guilty at all. He's the one who sent Ollie Barton to his death because Ollie was close with Deverson's wife. Remember that Deverson's death wasn't a suicide. He didn't take his life out of remorse; he was murdered.
Budgie was the one who was racked with guilt over Ollie's death because he failed to discover the live mine in his sweep-through. Though not explicitly shown, he is the one who placed the cross in the bricks of the armory. Recall the scene before Budgie is called in for questioning. He is unsteadily walking the streets, hearing the buzz of a metal detector in his head while carrying a grocery bag full of canned beer. A little while later, he is found on the ramparts of the armory by two officers. He is clearly troubled and has already been drinking heavily from his beer stash. Since he was at Deverson's house that fateful night, it is a foregone conclusion that he took the Military Cross and scratched "for Ollie" on it.
I can imagine that he didn't want the Military Cross to be in the hands of just one person, and certainly not in the hands of an undeserving person. Placing it in the armory was Budgie's way of making the cross a public memorial to Ollie.