Grumpy Dad:
Click on that link I sent, takes you to the gov site, scroll down to transport and driving businesses, next page scroll to manage your operator licence, you can alter your circumstances there.
Hope it helps
I thought it could be done in the Self Service area, I even thought I’d done there before, only to find there is still an O’licence, so called DVSA, where they told me it had to be form SUR1, but every link I find to the form sends me back to O’licence self service login, where I can’t find anywhere to surrender the O’licence, and DVSA just send links that send me back there, googled surrender o’licence, SUR1 and anything else I can think of but cannot find the form.