Average Week = 2 days off, 1-2 days standby and 3-4 days flying.
Days off are known and set in stone 4 weeks in advance.
I've been called out off standby "on the day" no more than 10 times in nearly 4 years. I have had standby's changed in advance maybe double that. Most standby's are just a day at home.
As for the flying, Report in the morning between 06:00 and 06:30 - Fly 4 sectors and sign off between 12.00 and 14:00. Afternoons report between 12:30 and 14:00 - fly 4 sectors and sign off between 19:00 and 22:00. Not much flying over the weekend especially in the winter. Total hours per year approx 500.
I couldn't be happier - this has got to be the best job in the world hasn't it.