Sleaford Navigation Hi Steve I have written quite a lot of the article about the Sleaford Navigation Do you know if the information about the lock sizes is published anywhere Both Skempton and Boyes Russell mention that they are 60 x 15 ft Wikipedia is about verifiability so without a source I would not want to alter it I note that the infobox mentions that the current size is 70 ft and Cumberlidge confirms that I was hoping that your website might mention it but sadly that doesn t either