Been in the banking business for 20+ years and never heard of LTI. Fair dues to you Brendan, I have no idea what the acronym (or shoud it be synonym) stands for. We would normally call this a RCR (repayment capacity ratio or sometimes DSCR (don't ask!).
the difficulty here is that when a policy is being revised both RCR and LTV are stand-alone. i.e. In order to approve under policy the borrower must have a LTV of 80% and an RCR of at least 1:1. The idea of percentages is a fair one, but how can a bank police this? It would lead to some strange decisions if you were near the end of the period and hadn't met your exception quota! Generally the safe thing to do is forget exceptions. They are potentailly higher risk and more trouble to process. Why would you bother if you were a bank?