A slump in the UK and Ireland sent revenues tumbling by 8% in the three months to June at credit checker Experian.Sales in Britain and Ireland crashed by 22%, with falls also recorded in North America (2%), Latin America (9%), and emerging markets (8%).The picture was better stripping out the impact of currencies. Sales overall rose by 1%. Latin American revenues rose by 15%, the UK & Ireland was flat and the rest of the World rose by 5%. North America posted a similar decline of 2%. Experian had already indicated it expected little underlying organic growth overall in the first half of this year and reiterated that forecast today."Our businesses traded in line with our expectations during the quarter, and we continue to expect little organic revenue growth in the first half. We are managing the business tightly and are on track for the year to broadly maintain margins, grow profits at constant currency and deliver strong cash flow conversion," chief executive Don Robert said.