PN - the last multi-year pay deal for MOD CS was in about 2008.
Since then its been linked to a maximum of 1% per year, and usually about 0.8%. In addition CS no longer progress up the pay spine in the way the military did (and still do?), so since 2010 you've gone up 1% per year linked to the amount you were earning in 2010, instead of 1% on a payspine increase of about 2.5%.
In practical terms this means many new entrants now earn more than long serving members of staff, and often junior grades can, and do, earn more than their seniors on appointment. This means many staff have had 6 years of deferred pay increases for seniority, and are earning 10-15% less than they should be had the pay spine progression occurred.
The reason this matters to the Mil is that I know many experienced staff, many of whom do highly skilled niche roles that requires years or decades of experience, are now walking away because the salary is no longer sustainable to look after their families. CS pay isn't ever going to make someone rich, but when its so patently failing to keep up with industry salaries, you can see why good people are jumping when they can, rather than hang around. This only makes things more difficult if your talent pool leaves, if the only people left are the ones who can't find employment outside...