Thanks Traveller. Your link doesn't open where I'm located in Germany (well done Google). Most of these apps unfortunately require Root access & I won't risk going this route. I'd settle for a simple power-down option. Maybe someone out there has found one? Obliged.
The problem with having a "simple" power down option is this: even the simple power down option requires root. Besides, if all you want to do is shut the tablet down, you don't even need one of these apps. Press and hold the power button and a shutdown menu should show up.
Given your tablet isn't exactly a well known brand, you may have no choice but to use Kingoroot. Especially as it's unlikely your tablet will have a custom recovery available for it.