The pilot replied:
“TWO TWO NINE, THANKS A LOT”.
This exchange ended at 0759:18 hrs when G-CRST was approximately 150 m south-west of Vauxhall Bridge.
Immediately afterwards the helicopter began to turn right. At 0759:25 hrs it struck a crane on the south side of the river 275 m from the south-west end of Vauxhall Bridge.
Surely it would be more logical to suggest the pilot was making a freq change at the time of impact.