In article , David
wrote:

The same is true for WB boilers. They're OK, the widely-published
adverts say how great they are, and they are backed by a huge fleet of
service and repair technicians

If they're that great why do they need a huge fleet of back up people?

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle