It depends on your work culture. You have used the words "colleagues" and "team". If you meant it, then do not separate yourself for a glass of upgraded booze which you can buy anywhere anytime.
The OPUP is a different story. You are boarding together and BA self-evidently reassigns you to F. Nobody expects you to give that up unless the culture of your employer is that people collaborate during the travel itself.
As to travel time, unless it really is expected that people work together during the flight, it is far better to sit apart.