If you don't have an army to speak of, why do you declare war on the most powerful country in Europe of that time? Doesn't make sense, unless Britain was serious about supporting Poland
In letter not in spirit, serios support could have been economical, there was very little of it even though UK had capacity to outfit an armoure division and another motorised division in Poland which could change a LOT.
Then I understand even less why some people here criticize Britain for her role at the beginning of WW2.
The problem is that UK led Poland on, there was no real support economic or otherwise, to give you an example UK could easily sell Poland up to 300 tanks prior to hostilities, it didnt.
The major culprit is of course France but UK had its part in it too.