Battlebus and Overlord have been very popular tour groups based in Bayeux. My personal experience was with Overlord, and I recommend them highly:
At the time of our travel, Overlord was a company that had French guides, and we found the commentary from a guide for whose countrymen had lived through the D Day experience especially moving. There were moments that were both proud and humbling.
Battlebus is also highly recommended on this forum and you may have trouble finnding them. Battlebus has scaled back, and I'll let these links from the owner explain how the company has reorganized:
Information on how you might find the Battlebus tour guides has been supplied by several contributors on this post and others:
I will try to consolidate that info here and hope others will contribute. I don't know these guides or their companies, but I trust TA travelers' experiences with Battlebus As part of the Battlebus team, these guides are likely to have been part of the reputation Battlebus has enjoyed on this forum, and I hope that other TA contributors will help you make your decision.
This info may change as these businesses establish themselves, but to start a traveler on their search, here are some links:
These two guides seem to have their own businesses:
A popular Battlebus guide seems to have joined this company:
Additionally, for those of you who would like to tour on your own, here is a link for audio guides:
Here is link for a discussion and list of private guides posted on the Normandie forum:
I know how intimidating it is to start a search for a trip. I enter a new forum and I look for the guys who contribute here. I trust them and wish they were there. I hope these links are helpful and others will contribute their suggestions.