Further to all of the above, reference the XK nose-cone cracks (very hairline), we today visited our new-found Indie Jaguar Specialist at Derby. Prime reason for the visit was the annual service, but we mentioned the hair-line cracks in the nose cone. A very affable gentleman determined that there had been a local repair at some point and that, as suggested, a complete strip-back, prepare, repaint and relacquer should solve the problem. A reasonable price was quoted, to include removal of the cone and all attached parts (therefore, no masking). We have decided to monitor the cracks and, if they become noticeably worse, then we shall book in for the autumn.
Apparently, the comments made on the thread are pretty much the case as it is, so thanks to all concerned.
Happy growling, as always