Section leaders for the main TUBBS ensemble are generally the same as those for the ladies and gents, so that members have just one name to remember. HotTUBBS is small enough not to need section leaders.
If you can't be at any rehearsal, unlike members it's your job to let the MD know. Easiest way is probably to email music@tubbs.org.uk.
As a section leader, you can see (but not edit) the music plans page; feel free to suggest changes and keep up-to-date on what's happening, again by emailing music@tubbs.org.uk. You also have a standing invitation to most committee meetings; dates, times and locations should be announced on the events page.