Check what your passport sticker (entry clearance or residence permit) or biometric residence permit (identity card) says. You can work in the UK if your passport sticker or identity card says one of the following:
Your passport sticker or identity card might say something a bit different from these examples, but you can work if it does not say:
You must not work if your passport sticker or identity card says “No work” or “Work prohibited” because this would be a breach of your immigration conditions and a criminal offence. The Home Office can check whether someone has been working by making unannounced visits to employers and by obtaining information from the tax department, HMRC.