So I rang the job centre to tell them I have a job. They provided me with a a leaflet when I first signed on that told me exactly what I needed to do. All very helpful.
First call - engaged.
Second call engaged.
Third call - I got through to a lady who said she wasn't at her normal desk and the computer she was at hadn't got the icon she needed! So they would call me back.
Half an hour later I got a call back.
I am no longer a jobseeker!