It is for the accounts of my girlfriends business. I have it listed in the accounts as:
CR - Bank £25
DR - Advertising £20
DR - Postage £5
but for some reason when I was looking at it last night I thought you don't split out the postage from the cost of the actual flyers. I think I've got it right but just having mind blank.
It's part of the cost of the flyers, so I'd charge it all to advertising.
I've always used the postage account for general stamps, sending letters and other postage for stuff sent out that's not part of the cost of sales, and charge postage on incoming items to the same account as the item that's been bought.
Agreed with John. Its part of acquiring the advertising. But in your circumstances, you could pretty much show it however you liked as long as your tax bill was correct!