FreeAgent-to-Xero Data Migration

I need every record that currently lives in my FreeAgent account moved safely into Xero. That includes invoices, expenses and the full bank-transaction history right back to day one, not just the current year... (Budget: £250 - £750 GBP, Jobs: Accounting, Bookkeeping, Data Analysis, Data Integration, Data Processing, Database Management, MYOB, Xero)