There is usually something in the hot cabinet until around 18:00 hrs or thereabouts, so filled croissants in the morning then ciabatta in the afternoon. Plus the soup. The standard for BA operated domestic lounges is that champagne is on request, it's just that LGW and ABZ make it generally easier to obtain. But EDI has a high staffing level so asking for a glass, plus any top-ups, shouldn't prove problematic.