SG
The 75/76 along with the -400 are the two most popular fleets in BA, and with good reason. Most are very happy with the mix of work, and the longhaul destinations are generally good fun and not too tiring, ie 4 or 5 day africa with a night flight out and a day flight home. At the present time the LH destinations are: Accra, Baltimore, Dar es Salaam, Detroit, Entebbe, Lagos, Lusaka, Nassau, Nairobi, New York (from MAN) and Tel Aviv. Rumours abound about the possible new routes but the expectation is east coast USA, Canada and/or Middle East.
SH routes are the major hubs, generally the rush hour business or popular tourist times. There are plenty of 'high credit' day trips for those who want to come into work as little as possible but still be home in the evening.
It's a relatively small fleet, in BA terms, with about 180 Fo's and you do get to know some of the guys and girls as you fly with them, or see them down route. LH cabin crew may complain because the routes are worth no money to them, and there are no bunks, but generally the places lend themselves to a few beers and a good meal, so fun is had by all!
The 75 may fall to Wllie's axe at some point but that will just mean it becomes more of a LH fleet, and hence a pay rise.
All in all a good fleet, fantastic aeroplanes performance wise and lots of interesting destinations. Spend a few years enjoying it before the general move to the -400 to do 'proper LH' until your number comes up for a command. Good luck.