Well you would think that would be the end of the story but no. Apparently, and according to the NZ Herald who probably got this off Twitter:
"The plane G-EZBV, an Airbus A319-111 which formed the Luton to Geneva service, had also been missing the seats since at least Friday when it flew Luton to Berlin as service U22103".
"Accompanying the message was a picture of what appeared to be the same seats, four days earlier, still minus backs. Although, at this point the seats had printed notes taped to them, apologising and telling passengers not to sit in them."
As an ex aircrew member I'm embarrassed for the cabin crew who had to fly in this and justify it to passengers, let alone the passengers who, as cheap as their airfare may be, probably didn't expect such a decrepit looking cabin.