If you are working, or have worked, in the UK and are from overseas then a tax refund may be due.
You are most likely due tax refunds in the tax years you arrive and leave (the tax year in the UK runs from 6th April each year) and for any periods you have worked with a temporary National Insurance number.
Tax refunds can be back dated for 6 years, since April 2000. And if you do not have your tax documents (P45s - when you leave a job; or P60s - the end of year summary given by employers you are employed by at the end of the tax year) then we can source the details for you so you can still make a claim.