Flambé bowl, unmarked - possibly Bernard Moore

Bernard Moore used that glaze.

Your right the glaze is very Bernard Moore but he is pretty much the UK founder and teacher of flambe. During his life time he worked for everyone and nearly every flambe product by every maker started with his designs or had its origin in the process he taught them. He is not as known now but back in the 1920's he was the Bill Gates of glazes.
It could be a 2nd, the base is not Bernard Moore though. I previewed several of his vases not two hours ago and this is far to crude to be by him. My guess would be another UK maker using the glaze techniques he taught and not getting it right. Still 1920's though. One of those items that will look great until you turn it over and then not so much. Could be anyone of about 20 different companies from that period not sure you will get closer than that. He did spread his skill far and wide and most makers did have a try even if they got it badly wrong.

Remember Bernard Moore was not a pottery, but bought in blanks from several
manufacturers, mainly Minton, for decoration.

I think most Brenard Moore is glazed completely underneath, but this could be a trial.