These are definately becoming more frequent. Both I and a friend recently received requests for all receipts for Med 1 claims we submitted in November 2007. They are definately getting stricter and rightly so, I think laying the process in the hands of public and relying on honesty may be a bit innocent! OP - browse the revenue website and make sure you ar claiming for all tax credits you are entitled to. Hold your hands up and be honest, best policy always.