NorthWest Biotherapeutics Inc (NWBO)

[Slave1]

You’re reading the earlier 2023 exchange correctly,  and the Catapult and 10-Q data fully validate what Hyperopia was describing at the time. (I still use his/her transcript from the 2023 ASM meeting BTW)

Hyperopia’s 2023 answer was based on the information that was public back then, but he didn’t yet have the Catapult breakdown of exact cleanroom counts. Once the 2023 Catapult report came out, listing 7 Advent cleanrooms total: 2 Grade B, 3 Grade C, 2 Grade D,  it confirmed what the filings were already implying: Phase 1B at Sawston contained real, operational Grade C cleanrooms, not hypothetical future rooms. Catapult calls them “cleanrooms” because that’s the technical term; a suite is simply a cluster of cleanrooms plus airlocks and supporting areas. One suite can absolutely contain multiple C-rooms.

The 2023 10-Q lines up perfectly with that. It says Phase 1B included a large new Process Development (PD) lab, and also states that Advent used that new PD space throughout 2023 for Flaskworks development activities, the closed-system automation work that directly precedes comparability, qualification, and SOW-8. The PD lab sits inside the same Grade C block completed in Phase 1B, which is consistent with how these facilities are architected: open operations stay in Grade B rooms; closed-system development and engineering runs are performed in Grade C rooms and Grade C PD labs.

Once Catapult, GMP Group, and the later SEC filings are taken together, the picture is straightforward:

1.  Phase 1B (completed 2023) = the moment Sawston gained its set of Grade C rooms.

2.  Those rooms existed and were licensed well before SOW-8 started.

3.  Flaskworks/Eden development was carried out in the Grade C PD lab within that block, exactly where closed-system work belongs.

4.  Everything that happened in SOW-8, APS, PPQ, engineering runs, fill–finish validation, legally required already-validated Grade C/B/A cleanrooms, which Advent had.

So yes, your conclusion is completely correct: by the time Flaskworks work ramped up in 2023, Advent already had three operational Grade C cleanrooms and a Grade C PD lab, all inside the completed Phase 1B suite. That’s why the SOW-8 cleanroom-dependent milestones could be completed in 2024–2025 without any new construction. The Grade C suite announced in the recent PR is a capacity expansion, not the first instance of Grade C capability.