RHWR = Radar Homing Warning Receiver
Overriddance = perhaps crew overriding the TFR, or a launch parameter, or an audible alarm
Cannisters = JP233 expensing its load I assume
Roland = SAM system
Delta & Charlie comments = Flight formation was 'Belfast', the call signs 'Charlie and 'Delta' are probably aircraft calling in as they clear the target
Under the wing comment = possibly the crew couldn't see the primary explosion of the ordnance?