As above, we would strongly advise you to speak to your School about your return to study prior to making a decision to interrupt your studies.
If you feel you might need reasonable adjustments because of disability or long term health condition on you return t to study contact Disability Support and/or request an Occupational Health assessment.
If you feel that you are able to return to your programme before the end of your pre-agreed interruption, you will need to speak to your School to see whether an early return is possible. You may find that you are unable to return to your programme at certain points in the academic year, owing to the risk of repeating, or missing, academic content.
If you are likely to be repeating content from before your IOS in a previous academic year, this could have financial implications on you. Your School and the Money and Funding Advice Service may be able to discuss this further with you.