You can't just source an A346 towbar at short notice, they're few and far between in the UK.
A resourceful and well connected station manager can perform miracles. I recall at JFK we had a generator failure on startup. Our SM borrowed one together with a licensed mechanic to change it from another airline within 30 minutes, for three bottles of wine from the C galley plus a promise that the part will be returned on the next days' flight. Promise was kept, proper paperwork was completed on both ends by the time the flight was well airborne, everyone was happy. Oh, he even had the time to make a PA at the gate every 30 minutes to keep pax informed on progress. It was all managed with a 90 minute delay, and he earned roughly his annual salary that evening.