Travelling in F from Syd-LHR, BA10 has a technical issue with some electronic box on one engine. They have tried to fix it but failed and they need a new part which is not in the airport.

After nearly four hours on the tarmac we have been deplaned and are being taken to hotels, whilst luggage remains on board.

Should I try to get another flight back or just await events and what are they likely to be?