I had a 2011 Citroen Dispatch which was smaller than the likes of Transits, Transporters and Vivaro’s etc; but it still had 3 front seats.
The middle seat wasn’t very big though and not really designed for any great distance.
If you wanted 3 full size front seats, I reckon you’d need to go Transit / Vivaro size.
The nice thing about the Dispatch was that it was just like driving and parking a C4 Grand Picasso.
You can buy a new shape Berlingo with 3 front seats, but after owning the larger Dispatch with a 3rd seat; I can only imagine how small the Berlingo seat is.
My Dispatch had the 1.6 hdi 90ps engine and it was good on fuel for a van.