You've probably confused yourself. You've certainly confused me...
When you said you couldn't receive BBC B, you were wrong. BBC B = PSB 3 and you clearly can receive it otherwise you wouldn't get any HD channels.
You can't receive COM7, which is where BBC FOUR HD was before the Olympics and now is again after them . It was only on BBC B/PSB3 for the Olympics.
The before/after files you sent showed no sign of LCN 106 on either after applying my suggestion of how to re-add BBC FOUR HD (in #58).
This is correct, because you can't receive it. Tunefix won't add channels for muxes you don't/can't receive (although at one point there was a bug where it did).
I hope that clears it all up. I need a cuppa...