Palma awkward today as well. No -5/+10 on slots. We called for push & start at CTOT -10 and were told we had missed slot. When questioned about the window, ATC 'reminded' everyone that the -5/+10 is at their discretion and it was not possible today. Reminded me of years ago at Palma! A quick glance to the neighbouring 24R showed no aircraft waiting at the hold. I know our colleagues in Spain have a dispute right now, and best of luck in fighting for your T's & C's, but who are you fighting? Us or them??