The console text at the bottom of the editor is now minute and cannot really be read.
Anyone got a clue as to how to remedy this?
The open console text is normal.
Is this on PC or Mac?
PC
Did this start happening after installing that hotfix? 
(though how since you only installed it, not got it active, so I suppose it can’t be that).
Must have been a glitch in Unity, some other things were going on and I restarted Unity and now it seems fine, thanks.
Windows Update says the hotfix was successful.