It was cheap, cheerful and mercifully short. Fast forward another 20 years and the reality is anything but. According to a new survey, the average cost of a hen do is now £157 per person, a fifty per cent rise in five years (up from £102 in 2008).And girls, unless we act now, things are only going to get worse. Now the UK hen and stag industry is estimated to be worth up to £500m a year in the UK.ith a lack of real-life anecdotes to go on then, as a child, my idea of what a hen party constituted was entirely based on TV show EastEnders. So, a night at the local pub, some ropy sausage rolls, an even ropier stripper wearing a ‘posing pouch’ and a mob of drunk aunties shouting ‘get yer kit off’.