How about C Grade or was that D Grade riding at the same pace as a struggling solo E grader?
Yesterday (Sunday), when I was riding what was effectively a 4 lap TT, due to a chain mishap at the start, I was passed by some grade(?),- not E or F- and after this bunch passed me, I kept on having to change my position on the road to avoid gaining "unfair advantage from another grade" as we approached the clubhouse, since the riders ahead of me were barely travelling faster than I was.
Eventually, they did put on the accelerator and the inevitable drop off occurred.
Maybe they were just feeling sorry for me and were giving me some respite. !!!!!