Closest I've come is Feb 2008:
200k on 2nd.
300k on 9th.
300k on 16th.
200k on 23rd.
One of the 300s was a DIY + cal, getting a lift to one of Keith & Sue's 200s from Norwich, riding the event, fixing a broken spoke at the finish and setting off to ride the 100k home at about 8pm - I got home something like 2am. I'd had to stop regularly to take the lid off my bottles to tip slush out into my mouth, having had a kebab in Brandon at around 11pm and carried some baklava from there for energy rations. I'd got a little lost near a farm and asked for directions. "Where are you going?" "Brandon". "What?!". I can't recall if I mentioned that was not my final destination.
I hurt my knee on the last of those events so didn't ride another 200k for about 3 weeks.