I work day shifts and have done now for about 5 years. I am also a Station Officer (WM B) and get 28 days leave, which are taken during the week (Monday to Friday). 3 days leave is taken at weekends.
The weekend leave is taken as follows : one weekend (2days) during the summer leave and the other weekend day is taken at the end of the winter week holiday.
We are supposed to take at least a fortnight for summer and a week for winter, with the rest of the leave taken as required.
We (Tyne & Wear) lost the 9 nine day fortnight system over a year ago, and it was replaced by a flexi system. What you have to remember is the 9 day fortnight allows the CFO to allow you to work only 36 hours a week but be paid for 42. Our CFO claimed back the 6 hours (his right to do so) so he could increase the extra hours for CS duties.
At first, alot of personnel were horrified by a flexi system, but the one big bonus is you get credited for every hour you work. So it doesn't take long for you to have accumlated enough hours to have a flexi day off. You are entitled to a flexi day a fortnight (with more if justified), so it is the same as the 9 day fortnight system.
The personnel that have gained the most out of the flexi system are the Training Centre personnel. In the past they have worked far more than the 36 hours, and often far more than 42 hours and nveer recieved any credit for it. Now as soon as they have accumlated the hours they are given the time back. E.g. at the end of a trainee course the Trainers have been given leave (some times two weeks) to cover the extra hours worked.
Hope this answers some of the points raised.