Another point about Club Europe is that as the seats are convertible, it means that they can move the curtain and change the size of the Club cabin according to demand.
On some busy business routes this means that the Club cabin can be almost the whole plane, and therefore service suffers as a result.
I have flown LGW to BCN frequently and there tends only to be about 2 or 3 rows of CE. LHR to BCN tends to be more.