It now appears that this is the original cabinet, though I added the castors. Professional repairs - output stage components renewed, and the new speaker is a BX, not a Celestion as I first thought.
I will try to post pictures soon. Rather than using a courier, I would prefer a local(ish) sale (I'm near Stansted); I will deliver within a reasonable distance for petrol cost.
I also have the original burnt-out EV speaker, which I understand can be reconed.