Speaking of flybys I did see, altogether too late, a Spanish Navy plane zoom overhead, not too high up which then disappeared out to sea at lower than rooftop height.
I couldn't get a decent photograph to identify it but my best guess would be one of these!
The colour scheme was grey-ish, maybe dull-ish silver with dayglo orange flashes.
If you have sharp eyes you can maybe catch a glimpse of it in the middle of this picture. It came in from my left over a headland and dropped down to below the rooftop height of the white tower in the mid ground before starting to gain altitude as it passed the launch towing the orange parasail.
Here's the best close-up I can make, it was a phone-camera after all.
And, Alan, I'm sorry, my brain never turned to gladiator rules.