For clarification:
The £130 isn't a winter fuel payment, per se; it's a payment given under the Warm Home Discount scheme.
When you pay by direct debit your electricity supplier continues to read the meter and calculate bills, in order to see whether you're ahead or behind with what you need to pay. Your monthly payments are then adjusted accordingly. When E-on next looks at your direct debit payments, to see whether they need to go up or down, your account will be £130 better off than it would have been without the the Warm Home Discount scheme, so there will be a smaller increase (or even a decrease) in your monthly payments.
Chris