At last it's now working, there were 2 issues...
1) There was a space - so many thanks for noticing that & replying
2) But when I removed the space (which was not visible in Alfreds text box, only by using the arrow keys did I notice the space), it did not fix the issue when removed as
3) There was a whole bunch of non-visible text to the right of x-cardhop://show?id={uid} from previous attempts I had made to paste in the URL Handler, I could only delete these, by arrowing to the right multiple times & deleting that text - I found many references to BusyContacts which I had attempted (years ago) & gave up to open - now I understand what the problem was. My suggestion to Alfred developers is to make this text box bigger, with 2 lines & perhaps use a FONT that makes a SPACE obvious - that way I would have seen what the issue was...
Thanks again GuiB for replying,