The Mazda5 is a great family MPV, or there's the Volkswagen Touran. Both are better than the Zafira with more versatile rear seats and better build quality. We'd recommend diesel versions of both, but if you're in London a petrol is probably better, as diesel engines don't fare well being constantly used for short journeys. The latest Renault Grand Scenic is also a good choice, but avoid the previous one as it had a poor track record for reliability.