EMBARGOED TO 0001 SUNDAY MARCH 28 File photo dated 25/09/20 of a person undertaking a coronavirus test. Firms are being urged to sign up for free coronavirus testing of workers before next week's deadline. Issue date: Sunday March 28, 2021. PA Photo. The CBI said the tests, free until March 31, were vital if employers are to minimise costs as they prepare to reopen after the lockdown. A survey by the leading business group suggested that just under four out of five companies do not currently offer testing, down from almost nine in 10 in January. See PA story INDUSTRY CBI. Photo credit should read: Andrew Milligan/PA Wire