Although I've still not found my written notes, I have found a Printout of mine of Locomotives that I observed at Swindon Works on the 22/06/1984. Interestingly, 27208 is not shown on that list. However, 27062 is shown on the list as seen during my visit. I did a little research and found that www.DerbySulzers.com state that 27062 was allocated to 27208 but never carried.
I have still yet to find any conformation that 27062/27208 was present during my visit. Hopefully I will find my written notes to see if this clarifies the situation.