The Tribunal has the power to reduce your award in certain circumstances. Your award may be reduced if:
Your conduct has contributed to your dismissal
Your employer has offered you your job back but you have refused it without a good reason
You have received statutory redundancy pay, but go on to succeed in an unfair dismissal claim (the Basic Award and statutory redundancy are essentially the same award, and you cannot receive both).
You would have been dismissed even if your employer had acted legally
The Tribunal does not feel you have done enough to find a new job
You failed to attend disciplinary meetings without a good reason
You have obstructed the investigation into your dismissal
If you have received benefits since your dismissal, your employer may have to pay some of your compensation to the Department for Work and Pensions to account for these benefits.