I'd just like to confirm the requirement to re validate a component we design and have manufactured. This is a fairly expensive process to go through so for this change I'd like to double check - my feeling is that we should. The component is a rotor that, during assembly, has a filler placed to help retain position of the subassembly. It has no real structural use outside of this as other features provide the structural integrity. Annoyingly the filler adhesive, which is used in very small quantities has been made obsolete so we have to replace it with an alternative - should the entire rotor now be revalidated with the new adhesive filler or not? It's circa £250k for the pleasure. In the meantime we're buying up old stocks but it has a short shelf life so not something we can put off forever.