All on the same ride this year: I saw Charles and Camilla, President Obama, President Putin, David Cameron, plus the heads of state from Canada, New Zealand, France, Spain, and umpteen other nations.
I was out on the bike near Pegasus Bridge on the 70th anniversary of D-Day when I came upon a massive traffic queue, so cycled to the front of it whereupon I reached a roundabout and my progress was halted by the Gendarmes.
About 10 minutes later, along came a convoy containing all the above. To say I actually "saw" them might be a slight exaggeration due to the blacked out windows on all the cars, but they were there; somewhere! Security was heavy duty for Putin and Obama in particular. Each of their convoys consisted of about 20 vehicles with armed guards sitting at the open doors of blacked out vans.
The start of one of the VIP convoys containing someone impo'tent:
Chas and Camilla weren't part of the convoy, but I saw them earlier boarding HMS Richmond. No Brittany ferries for them!