We've been told to test once a day due to a highly immunocompromised household member with stage 4 cancer. My 9 year old son tested positive last Saturday morning and immediately isolated, and the rest of us remain negative. Nipped it in the bud with little harm done, apart from a poorly child who is spending far too much time on his iPad & overindulging on Lucozade.
Not sure what the LFDs cost per unit, and I imagine the great Manx taxpayer is being fleeced as per, but I am very grateful for their supply.