We decided to stay at Common's Wood (3 nights), never having been here before. What a gem! For us it was perfect for walking (35 mins) to the Welwyn Garden City station to catch the train for visiting London. However, if walking is not your thing, there are numerous buses that go from outside the site by the QE2 Hospital to the train station. Common's Wood is smaller than the other Caravan Club London sites, very easy-going and relaxing, and very easy to find. We visited Hatfield House and grounds nearby. In future, we will always use Common's Wood for visiting London. We wished we had had the time to stay longer !