I wouldn't worry much about whether the spokes have been replaced or not. The original rims would have been marked as Raleigh Endricks at the center of the rim; if these aren't marked, they've likely been replaced. Endrick is Raleigh's name for box pattern rims. Westwoods are raised-center, rod-only rims, while Westricks are the most common - raised center for rod or calipers (Westwood + Endrick = Westrick).
MkII, eh? Hmm - GH8? At any rate, the Dynohub is around the same era as the bike; it hasn't been added on.
Where are those QR mounts, might I ask? I only see them on the forks.
The solution to your front end issue is this tool:
...which has turned these: