are you sure you're talking about siemens there Fred? Sounds more like the interest free CT set up before they switched to siemens finance with interest rates etc.
I'm pretty sure there are 2 routes into siemens finance, one that involves you as the supplier being registered and able to offer the finance directly, which would involve the need to have your finances assessed, the other simply being for the customer to apply for the finance directly.
It's been a few months since I spoke with them about it though.