Are you flying from Hearthrow or via Paris? Heathrow use the 340E's and Paris the normal 340. I went via Paris with them the other years and found them to be excellent. They've had new interiors fitted since I went with them, but they are a great carrier. You'll find my trip report here:
Manchester-Mauritius Via Paris, Sept 2007 (v.long) — Trip Reports Forum | Airliners.net
Enjoy Mauritius, it's a fabulous island
Darren