OMG i cannot beleive the cheek of some people.
i wouldn't do this but i would probably feel like turning around and saying something along the lines of:
ok, i'll give you the £25 for making the invites to MY hen party, oh and just to let you know you owe me:
£XXXXX for your bridesmaid dress
£XXXXX for your meal on my wedding day
£XXXXX for transport costs to my wedding venue
£XXXXX for your drinks on my wedding day
all of which I have paid for!
sorry just makes me so angry when people are like this!!!!!!