Others will correct me if I'm wrong here, but I think the first "attempt" to create a national body was when Eli Simpson formed the British Speleological Association in, I think, 1935. However, and despite the name, this was really just a "Dales thing" and got quickly plagued by politics. After the war, the Cave Research Group came to the fore as a national representative body, but the emphasis was on cave science rather than caving. Ultimately, that role was taken on by the British Cave Research Association (BCRA) - which still continues as an important constituent part of the BCA to this day. It the meantime, each caving region had developed its own regional council - e.g. the Council of Northern Caving Clubs (CNCC) for the Dales etc, etc - and the National Caving Association (NCA) developed as a sort of federation of these. In parallel, various specialist bodies had formed their own national structures including, for example, the Cave Diving Group (CDG) and the various rescue organisations. Finally, the BCA came about to try bring the whole into a single body which would be recognised, e.g. to government, at at national level.