Which countries in Europe allow for the use of Pilot-Controlled-Light?
Sweden has numerous airports that use pilot controlled runway lights. Such lights are typically turned on by making a long (10 seconds or longer) transmission on the airport frequency, though variations exist.

Some examples of airports in Sweden that use PCL are:


ESSD Borlänge/Dala Airport
ESGE Borås
ESSU Eskilstuna/Kjula
ESNG Gällivare
ESSG Ludvika
ESKM Mora/Siljan
ESND Sveg
ESGT Trollhättan/Vänersborg
ESKC Uppsala/Sundbro


For clarity's sake: This answer is not meant to imply that other countries do not allow for PCL, nor that all lighting on the airports listed is pilot controlled.