The food products firm reiterated that trading in March showed limited impact from the pandemic, while April led to significant changes in demand patterns.
To save cash, the ingredients producer has frozen all discretionary salary increases and non-essential spend as well as halting recruitment of all but essential new staff.
No employees have been furloughed and no government aid was sought so far.
In the year to 31 March, revenue rose 2% to £2.8bn while profit before tax was up 4% to £331mln. Net debt increased 25% to £451mln.
The dividend for the year rose by 0.7% to 29.6p after the maintained final payment.
Shares rose 1% to 643p on Thursday at the opening bell.