OK, having looked at this further and considered the circumstances, I can see how this came about. I had previously made a paypal payment for a service from UK2 and had selected automatic renewal. Therefore I can see that for this particular service how the prepayment plan got set up, although I hadn't seen this in paypal before. What surprised me was when I went to pay for a second service from UK2, they were able to set up another prepayment plan without me logging in and confirming it. This made me very nervous.
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