I’ve just discovered that form D777B is no longer available online and sends me to an old archive. I can download the PDF form via other links but I just want to check that it hasn’t been superceded by a new form that I’m not aware of ? 
dft.gov.uk/dvla/forms/~/medi … D777B.ashx
^ no worky. 
ETA: disregard, I found it now : gov.uk/government/uploads/s … /D777B.pdf 