My son and grandchildren are visiting from Chile in July. We have one car seat suitable for the youngest child and intend renting another for about £30 for two weeks to go in our own car in York - no problem. However my son had hoped to rent a car for a week to go to visit my two other sons in the south and then on to Heathrow. Prices of the cars seem reasonable but to hire children's seats is £104 per seat for a week, which seems outrageous. Does anyone know of a car hire firm that charges less for children's seats?