Text edit toolbar (not sure of correct term) disappeared?

Hi guys, I have a problem in Photoshop CC and would really appreciate some help.

I opened up an image and tried to edit some text in it. This is something I do all the time and I haven't changed any settings, but for some reason, when I highlighted text, the toolbar at the top that lets me change the font, size, colour etc of the text is no longer there.

Please se the screenshot attached. These tools would usually appear at the top of the screen. I am completely flummoxed as to where they've gone and how I can get them back.

Any advice would be greatly appreciated!

Cheers,

Alex