AFAIK the RF spectrum is covered by an EU Directive, so yes.
It is not quite that simple. Frequency allocations across Europe are harmonised to reduce problems between two countries where wireless signals are crossing the border and affecting equipment in the adjacent country and where the frequency allocations in each country are made by different governments.
But from memory 315 MHz is not a licence exempt frequency in the UK. It is used by licenced users so any un-authorised use could affect the licenced users equipment and could lead to siezure of equipment and possible fines.
The CE mark, genuine or bogus, does not mean the equipment can be used as licence exempt wireless equipment. Equipment operating on an allocated frequency by a holder of a licence still has to be " CE approved "