Flights to the UK (Belgrade)

Hi all, does anyone know if there are any direct flights to the UK (london Gatwick or Heathrow)? Being from the UK, I should know this, but I drove here instead of flying. I need to get back for a wedding, but from my research this evening, it looks like a quick weekend break in the UK is going to be tricky!

Any tips. suggestions, or advice?

Many thanks.