Chris Scott,
I can recall the introduction of the BA (ex Bcal) A320's but don't remember it being as early as April 88, didn't think they turned up until May of that year. I'm open to correction though, its a long time ago. BA used to send us as engineering cover on several of those night charters you mentioned, flying to places like IBZ, MLA, HER even down to TFS. Its possible our paths crossed during those first months. Incidentally I understand that all the early -100 aircraft, BUSB, BUSC etc have recently gone to the scrapman.