Eligibility for student finance in a repeat year of study will depend on your previous study history. The government provides funding for the duration of a course of study plus one additional year if needed. Therefore, if a course has a duration of 3 years, you would be entitled to 4 years of funding in total (3 + 1 = 4). So if you need to repeat one year of your course and you haven't previously repeated a year or studied on a HE course prior to this one, you will be entitled to the full student finance package for the repeat year.
However, if you have undertaken a previous course at HE level, your entitlement to funding will be reduced to reflect this previous study and although you may not be entitled to the Tuition Fee Loan or Maintenance Grant you would still be entitled to receive the Maintenance Loan (plus the Childcare Grant, Adult Dependants Grant and the Parent's Learning Allowance if applicable).