Thanks David...Now I'm a somebody
Clive, I'm certain it wasn't crimped properly. I didn't want to return it to Portland Trading and wait for a minimum of a couple of weeks for a replacement (It would probably have cost me 20- quid to mail it back anyway). I e-mailed them advising the thing wasn't crimped properly and they just said "Thanks, we'll let the factory know" (in China no doubt). No offer to send a replacement or compensation. Not the best customer service. I'll order an MG/Rover cable through one of the usual suppliers and put it in when I do the heater hoses along with the new closing plate. In the meantime the bodge is working well.
Here's another side effect of the bad cable. When I couldn't get the thing to shift properly with the new cables installed I assumed that the problem was worn bushings in the shifter so I ordered this from M. Satur.
I didn`t spot the bad cable until it was too late.......................pity!