Without looking at the numbers the British has been on a road to nowhere since home nations introduced their own champs.
(I have two English medals so perhaps I am biased but) it seems to me that if I were a Scottish runner I would want to be known as a champion by my local Scottish running peers - not by someone who lives in, say, Cornwall.
But attitudes vary. I interviewed one triple British Champ. who took the view that only the British mattered and so he didn't bother with the English. "Why would I bother with the English Champ. when I can win the British?"
But I interviewed one multiple English Champ. and he said he didn't bother with the British but "left it so **** could win it every year"!