I think there is a genuine misunderstanding here.
Tman and others see the question of declining mail volumes as a Black and white situation - its either down or its not and he believes its down.
For deliveries Posties its a little more complicated - they have seen their duties get larger and larger, bag weights and total number of pouches increase, average weight per item increase. Is it any wonder that Deliveries don't quite believe that volumes are down. In the past when volumes were rising duties were not increased and process were not put in place to reflect this, but now RM have changed the way figures are collated and where items enter the pipeline, and are using these figures to increase the average workload of a delivery postie.
I have always thought that these volume threads are probably misleading the real question is do you trust and accept Royal Mails figures. Deliveries don't some do. Whether volumes are falling or not is irrelevant to the delivery postie in his day to day work, the more important figures are attendance and call rates which have either remained steady, or in the case of attendance rates - climbed, and until this is recognised and taken on board by management then there will always be this mistrust.
Tman belives the "my bags heavier now" argument is immaterial to whether volumes are down, and from his perspective he is right. Less volume for MCs means less work and therefore a chance for RM to change working systems and head counts. However, in deliveries, despite his protestations, it has everything to do with it as a heavier bag or more bags means more work, the actual number of items may be down but it has had no effect on our jobs, yet RM believe diiferent and they keep adding more to our deliveries. I guess this is a circle that will never be squared but hopefully both sides can see and accept the other sides view on this at least on RMC.