Thank you for the prompt and clear response. Your added clarification on the 95% is very useful because I anticipate, given the room I have to work with, it being a challenge to get everyone in the shot and missing ears are not welcomed! Your comment re the Live View is also key especially since I will be using a tripod and thus it's more convenient and I now know more accurat .
Thanks also for the lens reccomendations. May I ask what made you specify those as opposed to F2.8 for example? Cost is always an issue for me but I wondered if there was anything else in your thinking. Thanks as always.