NAS is the most modern FDP system in Europe, having been recently completely rewritten. The move to Swanwick puts it on new hardware but its the same hardware, so no upgrade.
All systems will fail at some point, it is impossible to expect a computer system to never fail. You just need to have sufficiently robust fallbacks and procedures in place to cover those very rare failures.
Don't hold your breath for ITEC or any other replacement FDP system in the UK anytime soon. Replacement is not as simple as the high heid yins were led to believe and they've now had a short sharp reality check which is still reverberating around
BD