BOAC - I somehow doubt you will find a definitive list of Taxi-times anywhere. As I said before, they are variable and can change by the hour at some airports i.e AMS. The max permitted I believe is 40 minutes.
Standard time for most smaller airfields is 10 minutes but that goes up to 25 mins for larger/busier/more complex airfields i.e LHR/LGW etc
LGW for example has 20 mins as standard for runway 26 and 25 mins when 08 is in use.
Obviously not all aircraft will take that amount of time to taxi as it will depend on location of parking stand/weather/complexity/holding/wip etc, but it is a good average from which the CTOT will be based.
Example - XXX123 FILED EOBT 1200 from LGW means the earliest possible CTOT that can be allocated will be 1220 when on 08. This gives a zero delay. A CTOT of 1230 gives a 10 minute delay.