The A 380 paid its last visit to Filton today prior to the runway there closing at the end of the month - though the various aviation industries on and around the site will continue.
To mark the occasion the 380 took a number of Filton employees on a short flight around the West Country/South West. That's probably what you saw.
I'm told the 380 also did a low flypast at Bristol Airport today as well. It's done that sort of thing before and must have put the wind up the local nimbys again.
380s have been regular visitors at Filton in recent years in connection with testing etc.
VIDEO: Airbus A380 lands at Filton Airfield for the last time | This is Bristol