Hello Ian - judging by my own recent lack of success at Kew with the Representation Book (BT 50/147) - the Register is BT 51/62 - plus my conversations with Julie Halls who is the expert on C19 Board of Trade Registrations - I'm of the opinion that like myself, you will draw a blank in acquiring any more information on Registration 160988.
Kew's comments "no design included" is correct in that any image and or other comments of use, of this design, that were in BT 50/147 originally, have been removed at some time in the (distant) past.
Regret I'm unsure as to the exact meaning of the expression 'Patent Registration' ........ I admit to losing the thread of this one a little, and had believed we were speaking of a Registration only, rather than a Patent. Of course if it were the latter then maybe further information might be found somewhere, but believe we've probably discovered about as much information as we're likely to find............ and so it's not a p/w
There is a service offered here on the Board, regarding those Registrations of interest and where National Archive images and information would help to expand our knowledge. I know that Kew professional researchers do charge for providing data, although perhaps on occasions they do so for free - really not sure - no doubt you will discover very soon.
In future if there is a particular Rd. for which images and details are of benefit you can of course post here, and who knows we might be able to help.