It might be worth going back to your agent and enquiring how much WT+ would be in the first place. Sometimes, as stated, they have good promotions. Whilst it isn't Club, it's better than WT-- (especially on honeymoon

) Besides, if you do get bumped, it would be Club rather than only WT+.
Oh, go ahead and request. Granted it may not work and there may be 10 other couples on board, but heck, who knows, you may get a nice agent at check-in or at LHR. It could be the tie breaker: Let's see, Y is oversold, do I upgrade the nice honeymooners or the crabby
Mr Do-You-Know-I-Am-I-have-a-bit-of-gold-coloured-plastic-in-my-wallet?