I'm looking to book a transfer from Heathrow to Trafalgar Square area. We're a family of 6 so private transfer is just easier for us. Two of our children need to still be in a booster seat here. Our son is 6 and our daughter is 8. They must be in booster seats until age 9. We won't be bringing booster seats with us. I tried to get an estimate for a booking from exclusive airports and one question is whether we need a car seat.... does anyone know if this includes booster seats or if its just a car seat for younger children? are booster seats required in London? I know I could call (they don't seem to have an email address) but I thought I'd ask here first in case anyone else already checked it out. Thank you!