I've heard some horror stories about the Embassy in Kyiv, and the general feeling is that the embassies are now nothing but cash cows for the FCO.
A British citizen could bleed to death on the steps of the embassy here in Warsaw and all they'd do is call out contract cleaners (and send you the bill).
I remember a few years ago, when a young female English teacher disappeared without trace on her way home from work, up near Gdańsk. And indeed there was 'nothing they could do'. When a young Dutch man went missing a couple of years later in the same area the Dutch Embassy sent staff there, contacted the chief of police for the region, and even hired a detective who eventually tracked him down in a hospital nearby.
The Irish Embassy ring round people, even sometimes their employers (I was amazed when they called me to check if one of my staff still worked there) to check if their citizens are still in PL and still working. The NZ Embassy appoints someone to help expats settle in. The French Embassy goes to great lengths to put French people doing business here in touch with each other. Even the Serbian Embassy (or Croatian, I forget) runs a private club for their citizens here.
The British 'Embassy' here is a disgrace.
As for the original topic, the Polish Consulate in London can advise on what documents are needed. Unfortunately it means a personal visit there, but they are usually helpful.