The road you mention is Winters Lane, it wraps around the airfield at the 09 end. I seem to recall there being some issue with wingspan clearance but an A330 has done it (see below), so apparently so could a 787 (same wingspan) but the A350 is just under 5m wider.
EI-EWR - Aer Lingus Airbus A330-200 at Bristol - Lulsgate | Photo ID 43398 | Airplane-Pictures.net