However, the company's retail sales through its websites - including sales through the Friends of Joules digital marketplace - were up 66% year on year, as more customers took to online purchases during the pandemic.
Shares of the retailer, which shed nearly 26% of their value in 2020, opened lower on the London Stock Exchange but climbed 2% by 0840 GMT.
This holiday season presented British retailers with a unique challenge as they navigated strict virus-related restrictions while also preparing for Britain's departure from the European Union.
Making matters worse, the country went into a full national lockdown again earlier this week as it deals with a new fast-spreading variant of the virus.
Joules estimated the potential loss in revenues to be 14 million pounds ($19.01 million) to 18 million pounds if the new restrictions continue through to April.
($1 = 0.7364 pounds)
(Reporting by Indranil Sarkar in Bengaluru; editing by Uttaresh.V)