My local PO had a rep come and visit me as they wanted me to go onto the programme. We went through all of the numbers and by the time I buy my satchels in bulk lots of 100, I wouldnt really gain any extra discount by going onto the system.

I use a seperate dedicated credit card for all of my postage costs which provides my tax records and keeps everything very simple. This has tidied the postage side of my business up, without being tied to any one company or service provider..