HI Darren
I read your note and request with interest and lots of sympathy but sorry to say that COVENTRY did not have excocet weapons, so at this time I am not too sure which ship you refer to; however, I will endeavour to determine which ship it might have been with the clues you have stated.
Good luck with your task and I maybe able help at a later date.
Chairman HMS Coventry D118 Ass.