Yesterday's flight from PKX-LHR in CW: no interactions whatsoever with the CSD (didn't approach me at any point, and no problems with the service so no need to talk to him).
Subsequent CE connecting flight from LHR-CPH: My request for "just a glass of sparking water, please" was met with "I can't let you have just that - the ipad tells me I have to congratulate you on your 100th BA flight - you'll have to have something stronger - either alcohol or tea". Thought that was very well handled.