yup i think we have hit a limitation on the script
a lot of iframe scripts using Ajax or js seem to not work with 'externally based' sites (sites not on your own domain) - why? something to do with security or something, dont know exactly
the best option for you is to use a normal iframe in this case:
<iframe name="I3" src="http://astore.amazon.co.uk/lesmondsplace-21/202-8298719-1476605?%5Fencoding=UTF8&node=1" marginwidth="0" marginheight="0" frameborder="0" vspace="0" hspace="0" height="1050" width="100%"></iframe>
the above code will show ur page properly sized :up: