Rough translation of the NOTAM for the final flight:
Concorde G-BOAF Final Flight and Flypasts in Bristol area:
Departing Heathrow, estimated at 11.10, via English Channel, Landing Filton estimated at 12.42.
Inbound to Filton Concorde will leave controlled airspace at Compton (approximately 10 miles west of Reading), 250 knots, at 12.18
It will pass overhead Filton at 12.27, then continue west to the Severn estuary.
From there it will head down the Bristol side of the estuary and turn south to overfly Weston Supermare at 12.32 continuing east to overfly Bristol International at 12.34
Then it heads up to The Downs.
If it is landing on 27, it will go east to Cold Ashton (junction of A46 and A420), making a 180 degree turn to line up for landing.
Otherwise, if landing 09, it will go overhead Filton heading North then West 'over the M4' (tunnel!), making a 180 turn back east for landing.
Either approach it's estimated to land at around 12.42