No, I haven't seen that one, but if I'm interpreting your description correctly I don't think it would be allowable here under the British vehicle lighting regulations.
All vehicles manufactured for the U.K. since the mid 1960s have been required to have amber turn signals which are completely separate from the red brake lights. This is a problem that those of us with North American vehicles with combination red brake/turn signals often face come inspection time. It's a matter of finding a good inspector who will "bend" the rules a little for an import! (Some British 1950s/early 1960s cars also used combined red brake/turn lights on the rear.)
