The London to Paris competition had GBHBF (The Spirit of Paris) taking part. After it was over Sikorsky advised us that they would have authorised a 100/100% cruise if we had asked them.
A bit late; it was all over.
"Helicopter? What kind of Helicopter?".
I would do that regularly at Aldergrove to Tridents. A light Puma would get up to 160 knots on a 3 degree glide path.