Historical document identifying ownership

I am trying to identify the ownership of a local pier, which I think historically may have been The Commissioners of the Port of Arundel and the Harbour of Littlehampton.  When I carry out a search it states nothing has been registered.  Any pointers would be appreciated.  Thanks  

Mas s - only pointers would be your own local detective work - Searching for the owner of unregistered land – HM Land Registry

Thanks, I've drawn a blank from local enquiries.  It could just be that it was never registered way back then!