Fairly uncommon outside of planned training moves or more serious incidents. There's one booked reverser in the current WTT, that being 303 at 01:15 Mon-Thurs, albeit it runs out of service and can be prone to being cancelled as it's a rusty rail move.
Hatton Cross or Northfields are far more favourable to reverse trains at for late running, 5 points at Hounslow Central aren't used particularly often apart from the aforementioned few occasions, so it's seen as a bit of a risk to reverse during the day (especially during the peak) in case of a failure.
Even when they do work as expected, it does tend to create a bit of a bottle-neck as you can only reverse west-to-east, whereas at Hatton Cross or Northfields you have a choice of platforms and can tailor the platform used depending on where you can spot a gap to slot into.
Either way, the majority of controllers tend to avoid it unless absolutely necessary.