In regards to staff shortages it’s theres many factors in play. SWR are struggling to keep hold of their drivers due to their pay being so poor comparatively. On top of that, they’re trying to expand. Lots of guards are going driver, which then means there’s guards vacancies to fill, again while trying to expand.
The company is blighted by poor morale and long hours or poor pay (by industry standards) competitors are employing and paying much better, it’s not a surprise they’ve got no train crew.
In regards to rolling stock, what options are available? Loco hauled stock with DVT/TnT, 365s... other than that there’s not a huge amount surplus yet.