We're going away in a few weeks and will need to take a taxi (or Uber) to/from the airport. We have a toddler and will have her car seat with us. I'm not experienced with taxis, can anyone tell me, will they allow us to fit our own carseat in their car? I don't want any last minute issues as we'll obviously have a flight to catch! We're in Barking, East London if anyone has any specific recommendations! Thanks