What happened to the other BA A318, wasn't that kitted out as all first class?
There was some coverage a few weeks ago that it (G-EUNA) has gone for scrapping (at Twenthe in Holland) - at only 11 years old.
It does indeed seem that G-XATW will be joined by a second 321Neo, to be registered G-GBNI, that is currently at Finkenwerder.