Commuting - to UK / Scotland, would be impossible with the 3 days max off in a row rule, but this has now been changed.
Depends by what you mean commuting, if you mean going home once a month for 6/7 days then yes, if you mean going home every time you have time off the i would say not.
flight time approx 7 hrs to LHR (plus what ever for connection to scotland - this will be made harder by the change to terminal 4 - so you have to either change to get to term 1 or 5 for bmi/ba connection)
stby ticket 750 QR for economy 1400 QR for business ( you need to get the business ticket in case economy full, and seats in business, if you only have an economy they will not up grade you ). 4 flights a day from LHR, 1 LGW , 1 MAN.
plus you have to be careful how you commute, if you keep a house in the uk and commute back to it, even if you spend less 90 days a year in the uk can be stung by the taxman !