EASA as the European equivalent to the UK's Civil Aviation Authority is responsible for determining all aviation policy Europe-wide and from time to time publishes documents important to future UAS operations within controlled airspace.  The following EASA documents can be downloaded here:

Publishing Body	Title	Type	Actions
EASA	EASA - Preliminary Impact Assessment UAS Safety of Communications Final Report Vol 1 - 8 Dec 09	pdf	View/Download
EASA	EASA - Preliminary Impact Assessment UAS Safety of Communications Final Report Vol 2 Annexes - 8 Dec 09	pdf	View/Download
EASA	EASA - Preliminary Impact Assessment UAS Safety of Communications Inception Report - 13 Feb 09	pdf	View/Download
EASA	EASA - Preliminary Impact Assessment UAS Safety of Communications Interim Report - 27 Jul 09	pdf	View/Download