Extendable Dining Suite with 5 upholstered chairs, 2 with armrests

Recent my partner purchased me a beautiful dining suite that I would love to know more information about!
It is square but can be extended to rectangular by sliding both ends out & placing a seperate piece of wood in the middle.
It came with 5 chairs, 2 of which have armrests. The chairs have been reupholstered & I presume that once upon a time there would have been 6 chairs in total.
Any information, tips or suggestions would be greatly appreciated!
Thanks in advance.

Poor