Yes. And I suggest until you know them you no longer drive or ride on the roads.
Blimey, odd socks on today Drac? 😉
I have never seen or heard of anything for cyclists beyond left/right and the myriad funny little roadie signals for riders behind you. I just googled cycling hand signals to see if i'd really been that blinkered but can't find anything beyond left/right/stopping/'watch out there's loads of us' in the first 3 or 4 pages of results. What actually is it?? (internet being silly today: I suspect the rest of you can see a picture of it in the post above this one.^^)
I always operated on the basis that in a car the signal for straight on (ie not even the littlest bit 'right' if there are multiple exits) at a roundabout was no signal at all until you pass the exit before the one you are leaving the roundabout on, then left obviously. This is what I do on a bike too. Why do cyclists need a special '3rd indicator'?
[edit] watching the vid again i would have been tempted to indicate right (particularly if drivers don't know what a straight on signal is either) since the road seems to bend that way a bit over the roundabout. Not that it would have made a difference if the driver wasn't looking anyway.
[2nd edit(!)]
ah, found it. I think these days many people would confuse this signal with either giving way to oncoming road user, or thanking them for already having given way to you. Can't say I have ever seen it used outside those 2 options.