Hi Niels,
You do not remove bell housings from Bedfords to get at the clutch, the gearbox is unbolted ( 4 x bolts) from the housing and withdrawn, remove pan under the housing and the clutch can be dropped out the bottom. So, no need to remove the engine. Right, to the awkward part, or though not for you, as your cab is off. The tyre pump has to be removed, and after unbolting the gearbox, it is turned on its side and drawn back out, this has to be done, to clear the chassis cross member.
regards, Richard