Why Coastal Command also relied on Avro Ansons

Why did Coastal Command employ so many Avro Ansons instead of relying only on flying boats?

Flying boats were more expensive and took longer to build, so Ansons offered a quicker way to expand patrol-aircraft numbers.

Cost was only one constraint on the flying-boat force; production time also mattered. Large patrol flying boats could not be expanded as quickly as simpler landplanes, even when their range and water-operating ability were desirable. Avro Ansons provided aircraft numbers for patrol work while the more capable flying-boat force remained limited. The ideal aircraft for a mission may differ from the force a procurement system can field in time.