as others have reported most important thing here is when you sign the paperwork its a deed of assignment which gives them full access to your refund for that particular year so if they claim for expenses such as uniform about £60 for a tax year for you get a refund for that say £22 and anything else flags up they get all your refund if your total refund is low in total say less than £100 then they say their fees are £99 + Vat any refunds up to that value they keep and you get nothing . I would not recommend them as they are not transparent with their fees the whole process not helped my mental health as i was once targeted with identity fraud and having letters sent to me by HMRC triggered my anxiety you have no idea what these people are doing with your data