Hi there,
It isn't normally possible to use the "internet" from a point to point leased line unless it is a MPLS network (in simple terms the pipe is segregated into multiple speeds/services for different purposes) but when our clients have a similar service directly from their offices to our data centre, they can then pick up internet from us and we send it down the point to point either as primary connection or as a backup to their standard office line. I hope that makes sense!
All the best,
Matthew