Hi Didier,
I do not think there is anyone publishing works in the UK about General Bigeard. Most books only deal in general campaigns, and they are rare enough. There are only a handful of authors being published in the UK who write about French modern campaigns. One is Martin Windrow, who has published two books, and the other is Alastair Horne, who wrote his book back in the 1970's!
I see it as an enjoyable challenge to find and personally translate French texts. It makes it worth the effort.
Best regards
Mark