Sorry didn't read your post correctly, i would wait and lay jimmy with the correct amount to make profit win or loss.

I did a calc on the current odds and return

You can lay 204 @7 for a profit 203/193.80

The smaller amount on the right takes in to account commission if he losses.

But i would wait until you know your returns and the lay price comes in, if you need an excel sheet to just put in the amounts and it will work out results let me know.