If you believe that withdrawing or taking an interruption of study may be the best option for you, you are strongly advised to discuss your situation with an International Student Adviser before making your final decision.
If your decision is to proceed with withdrawal or an interruption of studies then as you were issued with a visa to study in the UK, UK Visas and Immigration will expect you to return to your home country. More information on what happens if you are reported to the UKBA is also available here:
If you take an interruption of study you will have to make a new visa application to return to the UK when you choose or are able to resume your studies. You will need to make a new visa application even if you still have time left on your old visa. This is to ensure that you do not face any problems at immigration when you re-enter the UK, as the UKBA may have cancelled your old visa without informing you.