Hi gunsmith

I'll second what Tomswango mentioned take a buddy, but also tell someone else when and where your going and when you'll be back. Better still have someone stay on the beach waiting for you, if only to carry your gear when you come back. At least should the unfortunate happen someone will know when and where.
I always carry a pony on my rig.
If you never dived the site before check with local dive shops/schools, they may give for some vital info on where not to dive and where's best to dive and when. Check out tide times as well. Diving off the French Coast, Normandy tides play a crucial role in when you can and when you shouldn't dive. I don't know the area your diving, but like anywhere new, I'd check with the locals first.
Dive safe, surface sound.