Intruder

our house alarm was triggered whilst we were away . We had a rather anxious couple of hours until our neighbours checked on the house and couldn't see any signs of a break in. The alarm showed that there had been an 'intruder in the lounge. The 'intruder' however was there all the time !  
   A helium balloon that I'd received on my retirement had come down enough that it was floating around in front of the movement detector . I hadn't even considered that it would be a problem . It now moves around with the slightest of breezes. 
Today after covid tests first thing we're in 'isolation' until results come back. Don't think we'll be travelling out of the UK again anytime soon!