I flew on a 20C and it was G-EUYG, with pretty tattered seats that do not convert. The 20C code appeared as I was going to the gate, so there was no equipment swap. I had never encountered 20C before, but it's not like I am on BA's A320s that often (probably once a month on average).

The info on the Wikipost is obviously no longer correct (it does not list 20C at all and puts G-EUYG under the 20D category) but unfortunately I don't have enough info to correct it.

Maybe some BAers can do a bit of editing? @:-)