The Certs were in the hands of Mark after the race. I extracted mine at that time and assumed that Mark had distributed the others at that time. Presumably he still has your cert and also the race brochure* (which in the past has traditionally gone to the team captain (if the team is made up of people who have rowed before), or to the newest crew member if not. I guess that is you!
* only one race brochure is given "free" to each team on registration. Further copies can be bought at the race venues at ca £3. Last year I had my bag with all the team brochures in it stolen on the way to the race, and so had to buy replacement copies for each of our 6 competing teams! Now I clutch my bags very closely when I'm on the tube!!!
We had a glitch with the certs a couple of years back and I rang the GRR organisers who were very helpful and posted them to me. We too had to make a crew name alteration on the certs and they were very accommodating. Check out the number on the GRR web site = 020 8398 8141
if you full in the form on the Contact us page of their website and explain your requirements and request a call back, they will call you.
I am pleased to say Sarah and Rose, made me a certificate right away yesterday, mailed it and emailed a copy. So very kind and helpful. I sent them a picture of my Great Grandfather's medallion as it was presented by the Waterman's and Lightermans Almshouses fund.. Michael