Some of our members receive personal tuition as part of their membership fee, but not all members do. Can we claim Gift Aid on the subscription fees of those that don’t?

No. The rules about memberships fees and Gift Aid are about the right to have access to personal use or services/facilities. If some members do have access, then in theory all have the right to access, even if they don’t actually use it. As such you could not claim Gift Aid on anyone’s membership fees.