The Only use I had for such was to prove your seatime when putting your papers in to the BOT or the DTI. When applying for jobs with British Companies it was always the old Discharge Book they wanted to see. Where the certificates you held were inserted by the then Shipping masters at the BSF with the relevent numbers and where issued etc. When looking for my NHI Insurance number a few years back this was the only place where I could find. Cheers John sabourn