Spraying will not help, but clear up and burn the infected flowers to prevent dormant spores forming and causing more trouble next year. Hopefully, spring in the UK is cool enough for this not to become a common problem.
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Loder Plants trading as Leonardslee Nursery
Registered address: Market Garden, Lower Beeding, Horsham, West Sussex RH13 6PP, UK | VAT no. GB620660764