Best infant carrier for occasional use?

[SuzeM]

I live in London and will mostly walk or take the bus with the baby, but need a car seat for the taxi ride home from the hospital and for use on holidays. Any recommendations for an infant carrier which will mostly only be used in taxis?

a mothercare £40 one if u r not going to use it often there just nice and simple and roomy to

Thanks babyjjbaby