Eldest son tested positive last Sunday - 2 LF and woke up with symptoms on the Monday. I ordered PCR for us all but actually the rest of the family stayed symptom free and negative LF so didn't bother with them. Younger son now full of cold - negative LF but can I use the PCR I received for him last week now? Or do I need to order another one/go to a test centre? Thankyou (and urgh!!)