Bicycle buggy attachment

[Pheebe]

I know I've seen one somewhere but can't remember where. It fits on the side of the buggy as an additional seat instead of something like a buggy board.
Any one seen one
thanks
Phee

strolli rider

Thanks

Swiss Strolli

Thanks Loopy, its for my neice who has cerebral palsy and now two younger siblings. SIL is a bit concerned about her balance on it so think she might go for the buggy board with the additional seat so Maisy can choose whether to sit or stand
thanks again everyone

Which magazine tested this and said it was unstable on any uneven pavement and crossing roads going off and back on the pavement via a lowered curb.

We always had a buggy board which was fab but my son was not tall enough to see over the hood of the pushchair so constantly lent at an angle to see where we were going.