JetJockey A4, you have just posted your ignorance for all to see.
Firstly, as many have already stated, standards across Europe are not consistent, and there is no "Eurocontrol".
Secondly, there is no VFR in class A airspace, regardless of met conditions.
Thirdly, just because you couldn't see conflicting traffic, the refusal of a climb is not grounds to brand an ATCU inefficient - that conflicting traffic may have been crossing your track in another five minutes - how much would you be complaining if they had permitted your climb and then two minutes issued a descent instruction?
You might want to consider your own professional knowledge and ability before criticising others'.