Taxis & Mini Cabs
This will be a tricky one; so far most parents I have spoken to have had good, less good and bad experiences with almost every single one of these companies. I am going to list them, because they can offer car seats if you like. A good tip is to re-confirm before you need them. They are in alphabetical order and not in order of quality of service. This page will continue to be updated.
Buggy & Car Seat Cleaning