Quickest is definitely taxi along M56.
Easiest (& quickest), is taxi, but it isn't the cheapest.
If we need to be driven we use Parkers Airport Chauffeur, 0151 355 2595, last time it cost £50. They are completely reliable in our experience.
There are cheaper deals advertised in the local paper but I have no experience of them.
Have never attempted to do it by public transport. There might be a National Express bus to the airport.
Cheapest possible fare for a Senior is almost £12 each and that fare may not be available for the date and time you want to travel. Personally, I would pay the extra and order a taxi.
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