Fox2long, Who did the repair quote? If it was not Breitling I would send it to them for a quote. (Ernest Jones can do this for you).
I have had my Aerospace serviced by Breitling for over twelve years. A battery replacement includes the watch being tested for accuracy, a print out is attached with the returned watch, They also replaced the crown which was worn, and two new seals fitted. All old parts returned to me which had been replaced. Well worth £85 every 4 or 5 years IMO.