Wingnut,
Looks like a plan - though I still can't believe you'd put yourself through five flights in one day!
I'd upgrade on the LHR - GLA flights and the LHR-EDI one, as the others will be operated with planes (Embraer and Fokker 100)where the business class seats are the same layout as in economy.
I particularly enjoy flying business class on off-peak flights. It's so much better when there are only 5 or 6 rows of C class rather than the 30 or so on a peak time Airbus 321.
The GLA Gold lounge is superb. Only been in once but we got genuinely personal waitress service and were led out to the plane with the Q held up to allow us on.
The MAN lounge is pretty disappointing, as it seems to have a fairly limited selection of magazines.
Please post a trip report - I'll be interested to know what the lounge and security staff make of your frequent visits!
Cheers
Nick