(vi) Debtors

2013
£'000
2012
£'000
Amounts owed by subsidiary undertakings36,11918,735
Group relief receivable3,9511,699
Deferred taxation (see note (ix))579571
Other debtors176301
Prepayments and accrued income153
40,97821,306

Included in debtors are amounts of £579,000 (2012: £571,000) due after more than one year relating to deferred tax assets. Of the amounts owed by subsidiary undertakings, £nil is due after more than one year (2012: £nil).