After a while off (nearly 2 years!) I've just gone back to this as we are heading into our overdraft earlier and earlier each month. 
I've set it all up again with fresh start, so scheduled transactions are all in, overdraft is in and obv we have 0.00 available to budget but will have more coming out in the next few days before a payment in on the 16th.
Can / should I allocate money to those categories - food/holiday and alcohol (camping with friends with weekend booked months ago..) and go into - or just enter the amounts when I've spent them and allocate the rest of the payment on the 16th when it arrives?
Also, just trying to remember how the software works - all scheduled transactions will automatically appear in the budget on the correct day won't they?