Hi there, 111KAB, and welcome to the forum.
A good place to search for such information is on a website called 'libhomeradar' - just google the name and you'll find it. It can take a bit of time to get to know how it works, and it is, of course, only as accurate as the information put into it.
However, it gives the following information for the MON 958 BHX-PMI flight on 3 July 2012: G-OZBP 321, and MON959 PMI-BHX flight on 4 July 2012: G-OZBW 320 (dep. PMI at 1136hrs local).
G-OZBP then returned from PMI to BHX later in the day (dep. PMI at 1254hrs local) as flight MON959B, then flew BHX-MAN as MON915P before doing a MAN-VCE-MAN. On 5 July it did return trips from MAN to Faro and Dubrovnik.
I can't say if that's correct; I'm just reporting what is in the system. (Departure times do not relate to actual flight times; more when the information about departure was put into the system.)