Sorry, but the swim coaches asked us to stop members from swapping 1-off classes on the forum, as it was causing a lot of disruption for them if someone of a differing ability turned up to the lane. Sometimes more than 1 person would arrive as well!! If someone knows in advance that they'll be missing a block of 3 classes or more in a row, then they should contact their swim coach directly to sort out a temporary transfer of their place. Alternatively they can contact email@example.com if they don't have their coach's contact details.
Thanks for being nice enough to think of offering it to someone else, but we have to make sure we work with what suits our coaches