Anyone in old blighty rang them at the number on their website?
I think their site is long gone
Each time an old manufacturer closes it leaves a gap for a new one to fill.
Funnily enough, The Nick Collier's ECW sculpts he did for Renegade Miniatures were done quite some time after the ECW sculpts he put together for Bicorne. Both ranges are very similar in sculpting style and fit together nicely.
Happily, the Bicorne Miniatures ECW range is still available.