Caution: reservations is grabbing the wrong class:

Searched ewr-lhr (r/t) 12/7-12/12, BF.

Clicked on CO28 for the 7th (showed, "D").
Selected CO111 for the 12th ("Z"). Was wondering why the price dropped so dramatically from the first selection page... but hey, you never know...

On the final page, CO28 shows booked into "M". Ouch... no warnings. Someone not paying attention could end up rather displeased - non refundable, wrong cabin.

Seatcounter shows 9 J and 4 D for CO28.

I saved screenshots for co.com support.

Also reporting to co.com support.