Longer ron
Correct. Every item in the inventory has a notional Out of Service Date from the day it is conceived. Every time you seek to spend money (but especially capital expenditure) you must be prepared to state this date, because financial rules prevent capital expenditure within 5 years of OSD, unless safety related. And even then, this safety caveat was removed in 1992/3 by AMSO, although ignored where possible by MoD(PE). This is directly linked to current problems.