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It is certainly not too late to take this matter further to the small claims court if you wanted because the time limit for doing so would be 6 years and this only happened several months ago. So as far as the legal time limits are concerned, you are still well within time to do so. Assuming that you were simply after a reimbursement of some or all of your money paid for the holiday, then you can make the claim online via www.moneyclaim.gov.uk
Thank you Ben, I think we will go down the small claim route, the money is of secondary importance but the Northumbrian agency are still marketing this grotty property.