Part of the reason for different policies is the logistics chain of the carrier
Items could go by road, rail, sea or air - even within the uk
A standard route could change by circumstance. Eg mail to an island could go by boat or plane and may switch depending on timing and weather
If items are correctly described and sent via the correct method then most items could go by any uk carrier
Blame the vague or non descriptions in the past for issues that have flagged and particular distrust of the general public.
Items could go by road, rail, sea or air - even within the uk
A standard route could change by circumstance. Eg mail to an island could go by boat or plane and may switch depending on timing and weather
If items are correctly described and sent via the correct method then most items could go by any uk carrier
Blame the vague or non descriptions in the past for issues that have flagged and particular distrust of the general public.