You can get 10% of your guaranteed amount after 10 days, for free. If you need more of your guaranteed amount sooner, you can get as much as you need, or all of it at once, after 10 days. This is for a fee of 0.02% per day, capped at 1.6% over 80 days. Therefore, if you only need to take the extra from day 70, you won't pay as much as if you need to take it from day 10.
The additional fee is only charged on the amount you need to take early - for example if you needed an extra £5000 early, you would be charged 0.02% of £5000 per day = £1 per day. 

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