Did you have the garage alarmed? Were the bikes secured?
The insurance company may ask these questions and more whilst investigating your claim, they will do all they can to squirm out of paying the full amount.
Edit; just seen the above post.
That is not my experience of insurance companies - but i do not buy cheap insurance. I have had every claim settled very quickly and without quibble. The loss of my long term business would cost them more than the claim.
I'll be interested to see the OP's experience with John Lewis Insurance who sell on service not price.