There is a hole through the middle of my bread! Help please.

I have been making Annabel Langbein's busy peoples bread recipe for a couple of months. It has been trial and error however I seemed to get the texture just right but my last 2 loaves have had a hole through the middle. Can some please tell me what I am doing wrong. I have changed to a deeper bread tin so I'm not sure if that could be a reason.Thanksfrom Sue from New Zealand

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