Thanks for your replies.

Looking at their website, they seem to have a relatively new product for TA flights, with a flat seat, as opposed to LH's not quite flat offering, with a massage function.

In addition, my current flights are on a Tuesday, mid November. The Tuesday direct flight has just become available. What are the chances that a couple of seats will become available for the CO flight, on the Sunday?

As a change fee is payable, it would be better not to have to change to the direct Tuesday flight, then to the Sunday if it became available.