garmin varia for London commute?

After a few years hiatus I’m going to be back bike commuting in London.
I’m interested in the Garmin Varia from a safety perspective - is anyone using it for that? To warn them of nearby cars - and alert drivers to turns they’re going to make?
I love the idea and I’m a nerd - but I don’t want to splash the cash if it’s not going to make a difference...
I’m interested in the Garmin Varia from a safety perspective - is anyone using it for that? To warn them of nearby cars - and alert drivers to turns they’re going to make?
I love the idea and I’m a nerd - but I don’t want to splash the cash if it’s not going to make a difference...
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Saw someone with the helmet that incorporates an indicator light the other day - that looks like something that would tell drivers you're about to turn if that's the feature you want.