The 2000 TAP did indeed have the cct height at 1500 ft agl & when we used to visit Brize on a PD we flew 'high-level' ccts. When we re-located to Brize in 2011 there was a short-lived attempt to fly C130 ccts iaw our SOP ie: at 1000ft agl. But then you weren't there in 2011 so you wouldn't know that.....
No point in going to Specsavers as the RAF has its contract for CFS with another opticians, in Swindon I believe.