Thanks - but originality is the problem I have! I know the hazard in-line fuse is original, as I didn't even know it existed until a few weeks ago. One of the 4 is 17 amp and looks original, but the others do not and are different values. Though I have no recollection of doing so, at least one is certainly not original... Many years ago, I appear to have drilled out the endcaps and soldered in a new internal fuse wire!

Francis