Windscreen water leak 💧

Hi,
I have just this week noticed a water leak from the top of the windscreen on the left passenger side ( I’m in UK ) my car is a 2016 Q30S. During a heavy down pour, there was a slight run of water down the inside of the screen, this morning when I got in my car it was completely steamed up with condensation and the front passenger footwell is sodden ! Completely soaked.
I don’t think all of the water has come from the top of the windscreen, I think it’s getting in down the side also, near the passenger door.

would a dealership look at/repair this fault free of charge as the car is nearly 7 years old ? Or should I just install a bead of clear hi quality sealant myself ?

Any advice appreciated.

thank you.

Heath