The Fiat Qubo is a compact and affordable van with five seats. It's also available with petrol or diesel engines: vans.honestjohn.co.uk/van-reviews/fiat/qubo-2009/

The Ford Tourneo Connect will cost more to buy, but will provide lots more comfort and car-like refinement. The engines are quieter than the Fiat and you also get more kit as standard: vans.honestjohn.co.uk/van-reviews/ford/tourneo-con.../

If you want more something more work-focused (and less refined) then a five-seater crew cab version of the Transit Connect might be better: vans.honestjohn.co.uk/van-reviews/ford/transit-con.../