So I am guessing this has been discussed in the past.

Please enable an option for auto-manifesting to turn it off or on, with this option Future Manifesting also wouldn't be needed. Why we need to contact customer support I don't know.

The reason for this should be fairly obvious. Our mail is done by average weight, we have large letter products that are 50g and 155g or higher. We are consistently overcharged by Royal Mail as when they are manifested together they average out higher than they should.

Second reason being, since a paper manifest is needed (why?) if we are printing off to drop off this is done way before the auto manifest kicks in which happens between 1800-2100 most nights.