Moving into girlfriends aparment. Do I pay before I move in or after I month?

Moving into my girlfriends flat with her, we have agreed I pay £450 a month. I am just wondering if I should be paying her £450 on the day I move in or do I wait for 1 month and then pay her £450 every month? I don’t understand it. If anyone has been in a similar situation I would like to know what you did. thanks... show more Moving into my girlfriends flat with her, we have agreed I pay £450 a month. I am just wondering if I should be paying her £450 on the day I move in or do I wait for 1 month and then pay her £450 every month? I don’t understand it. If anyone has been in a similar situation I would like to know what you did. thanks in advance
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