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If you haven't heard already, your application may be refused on the basis that the application reached UKBA with its fee after the expiry date, if this is the case you should be allowed leave to appeal and should appeal and set out your case. Especially since you meet the required points.
On the other hand, you may be lucky and the caseworker may see that the application was returned due to non payment in first instance, but payment has now been made.
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