The schedules seem to show 2x B738s based at both PMI and ALC this summer. The aircraft at both PMI and ALC operate two returns to the UK each day (except for Tuesday afternoons in ALC, and Tues/Weds afternoons in PMI).
This is on top of the UK based aircraft operating to both PMI and ALC.
Looking at the timings on a Monday in August for example:
PMI Aircraft 1:
PMI 07:30 - STN 09:05 (45min turnaround) STN 09:50 - PMI 13:25
(1hr 10min turnaround)
PMI 14:25 - MAN 16:15 (1hr turnaround) MAN 17:00 - PMI 20:45
PMI Aircraft 2:
PMI 08:00 - BHX 09:35 (45min turnaround) BHX 10:20 - PMI 13:50
(1hr turnaround)
PMI 14:50 - LBA 16:40 (45min turnaround) LBA 17:25 - PMI 21:10
ALC Aircraft 1:
ALC 07:40 - MAN 09:35 (45 min turnaround) MAN 10:20 - ALC 14:15
(1 hour turnaround)
ALC 15:15 - MAN 17:10 (45 min turnaround) MAN 17:55 - ALC 21:50
ALC Aircraft 2:
ALC 08:00 - NCL 10:05 (50 min turnaround) NCL 10:55 - ALC 15:00
(55 min turnaround)
ALC 15:55 - MAN 17:50 (45 min turnaround) MAN 18:35 - ALC 22:30