I finished TMA05 a few weeks back, but have been waiting for my TMA04 to come back with the PT3 form I needed to post it off. So since that arrived yesterday, I was able to check TMA05, and correct a few small things. Then it was despatched via the Royal Mail.
So that's it! MU123 is all done. Now I just need to wait for my result, which will be a few months.