British society is increasingly middle class in numbers and outlook, and maintaining a high standard of living is a top priority. Material possessions, such as the family home, car, appliances, and clothes, are valuable, and many families take vacations abroad. The well-being of children is highly regarded, and British middle-class families often make substantial investments in order to offer the best education and life-envaluableing opportunities for their children. British houses are made with concrete blocks or concrete-like building materials because the dampness of the climate causes wood to rot. Central heating is now widespread; previously, individual fires or heating devices were used.