Anyone know what Terminal 4 at Heathrow is like right now?

We leave for Scotland via London Wednesday evening, on BA 102. We arrive, according to British Airways’ information, at Terminal 4. I consider this a good thing, given that Terminal 5 is a living nightmare right now.

However, that said, there is NOTHING in the news about how the other terminals are faring at Heathrow airport. Does anyone know what baggage delays — if any — exist at the other terminals? Pileups at one surely must affect the others. Any and all pointers are appreciated! 🙂