How exciting that you are about to start your own LL journey! I can't get over how absolutely fabulous this diet is, and you'll be forever thankful you've done it!
My session has been taken by locums a lot, but they are all lovely, so don't worry! They'll be trained and anyway, you get a lot out of the sessions some weeks, and others it will feel like you just had a general chat with the girls! I just stopped expecting to have a penny dropping moment every week and I've been getting along fine. Wouldn't let the fact that they are locums worry you!
Best of luck to you!