well, as a bump to this thread I finally got my new amp, a Yamaha A-S301, very nice too.
connected it all up only to find that as my previous amp died it took out the speaker that was connected to the right channel (bass cone is now very scratchy with no real bass behind it).
Went to the attic and retrieved the 38 year old original Panasonic speakers and I'm, back in business - the music is back!!.
The bass cone on the blown Wharfedale makes a scratching sound when gently pushed whereas the survivor is silent. Need to source a new bass cone from somewhere - a Wharfedale Model 1510H bass cone and get it up and running again. Would be a shame to ditch them if I can replace the speaker