pre_text: 4. Debtors Amounts owed by Group undertakings are non-interest-bearing, unsecured and have no fixed date of repayment.
table: 2019 2018
table: £m £m
table: Amounts owed by Group undertakings 414.7 439.9
table: Deferred tax asset 1.2 0.8
table: Total 415.9 440.7
question: Analyse this data from a financial earnings document. What was the change in deferred tax asset in 2019 from 2018?