Adessia is more like a modular platform, there is no reason why the bodyshell couldn't be similar to the Aventra.
If it comes with different control systems, wiring looms and software that works and is standard to all Adessia then that seems big improvement.
There is a question if UK actually needs more pure diesel trains in next 15 years. It is true some have been built in recent years, but some could potentially be replaced by battery EMUs (eg West Midlands fleet). These (and 170s with 15-20 years life) could be cascaded to the fringes of the system where electrification is not on agenda in next 15 years. A proper national cascade might be better than lots of pure diesel trains under the wires for part of their journeys
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