/// <summary>
        /// Takes a service (Organisation / Company) and polls company for all invoices within certain date range       
        /// 
        /// Multiple overloads depending on what you're looking for - invoice types, from a particular contact, etc etc etc 
        /// </summary>
        /// <param name="aService"></param>
        public List<XeroApi.Model.Invoice> FIlterXeroInvoiceTypesForAquariumInsertComparison(InterResolveXeroService aXeroCompanyToCheckAgainst)
        {
            //this is the list we will be passing back and removing items from should they exist in Aquarium
            List<XeroApi.Model.Invoice> theXeroInvoices = aXeroCompanyToCheckAgainst.GetAllPurchaseInvoicesOfTypesThatNeedToBeInAquariumFromXero(DateTime.Now.AddMonths(-3), DateTime.Now);

            //now filter these invoices to only the correct 'types' e.g. account codes

             List<XeroApi.Model.Invoice> theFilteredXeroInvoices = (from invoice in theXeroInvoices
                                                                    where invoice.LineItems.Any(
                                                                        x => x.AccountCode == "54070"
                                                                        )
                                                                      ||
                                                                       invoice.LineItems.Any(
                                                                        x => x.AccountCode == "54110"
                                                                        )
                                                                         ||
                                                                       invoice.LineItems.Any(
                                                                        x => x.AccountCode == "51070"
                                                                        )
                                                                         ||
                                                                       invoice.LineItems.Any(
                                                                        x => x.AccountCode == "54110"
                                                                        )

                                                                        //ds
                                                                 //   .Where(X => X.LineItems.Any(x => x.AccountCode == "54110")) //ds

                                                                //    .Where(X => X.LineItems.Any(x => x.AccountCode == "51110")) //tp trf
                                                                //    .Where(X => X.LineItems.Any(x => x.AccountCode == "51070")) //tp trf
                                                                    select invoice).ToList();

                                                                   //AccountCode == "42010 - Third Party Income - Scheme Fees (Claimant)")

            //for that company look for invoice numbers of a certain type
            //that aren't in the LeadID and Inbound Invoice / Medical Treatment Table (PULL DISTINCT LIST OF INVOICE NUMBERS FROM AQ AND COMPARE)

            //For each Lead, write in necessary table row to :
            //MR or Treatment tables (optional)
            //Inbound invoice table //necessary

             return theFilteredXeroInvoices;
        }
        public List<XeroApi.Model.Invoice> GetXeroInvoiceNumbersForLastThreeMonths(InterResolveXeroService aXeroCompanyToCheckAgainst)
        {
            List<XeroApi.Model.Invoice> invoices = aXeroCompanyToCheckAgainst.GetAllPurchaseInvoicesOfTypesThatNeedToBeInAquariumFromXero(DateTime.Now.AddMonths(-3), DateTime.Now);

            //do something with these invoices

            return invoices;
        }