How does it compare with tax and insurance on a van versus a car?
Also vans are banned from some places like council recycling sites without extra paperwork / etc.
No experience, but an MPV like a Renault Espace is roughly van shaped while counting as a car.
Also, if you're fishing at the elderly end of the pool (2000-2004), the Toyota Yaris Verso looked interesting as a small MPV with a big boot and enormous rear window. The newer Toyota Versos are a bit more run of the mill.
Theo