At home Seth has started being able to choose what he wants; a couple of times I have misinterpreted his body language thinking that he needs to go to the toilet. However, once being helped to his feet (which again as long you are standing behind him supporting under his arms he will bring his knees up so his feet are flat on the floor, push up through his legs and then walk his feet backwards so that he is standing up straight) and walking him out of the living room, he has stopped at the door, turned away and walked to his chair where he eats his meals, with me behind trying to keep up! The 2nd time this happened I had moved his chair and so he sat on the floor where it should have been. I helped Seth back up and asked him to find his chair. He walked around the living room until he came to it whereupon he lifted his foot trying to step up into it.
Seth is now so strong and confident on his legs but his upper body muscle tone is still letting him down preventing him from being able to balance. Every so often I test this though. I figure if he finally learnt to sit unaided he should be able to do the same when standing. So sometimes when it feels like he might be ready I let go of him. I'm ready to catch him as he topples but I want him to feel what it is like to give him the opportunity to find his own balance. And on Thursday during Seth's trampolining class he did it. For at least 10 seconds Seth stood completely unsupported. It was breathtaking. This evening I tried again and after a few failed attempts Seth again stood for several seconds alone. He even took 2 tiny steps forward before I felt he was going to topple and took back hold.
So now I have something new to work on :)