Turns out you guys actually weren't all that far off.
They're stalling us because a distant relation (fiancees, sisters, boyfriend or something) is potentially interested in it, but they haven't actually viewed it yet and are viewing it this week.
I’d keep looking, they may come back and accept your offer but are clearly in no rush.
I had something similar, had an offer accepted on a place on a Friday, agent called on the Monday to say a relative had come over at the weekend, found out they were selling and wanted to buy the place. Fuckers.
Turns out you guys actually weren't all that far off.
They're stalling us because a distant relation (fiancees, sisters, boyfriend or something) is potentially interested in it, but they haven't actually viewed it yet and are viewing it this week.