OP .. can you believe this: "Asus Google Nexus 7 7 Inch LED 1.5 GHz 2GB 32GB Wifi - Black - 2013 Version Refurbished With a 12 Month Argos Guarantee £139.99" That's the price I now get, when I click on your link above. :-( Lol.
I think the NEXUS 7 was a beautiful Tablet in it's day (and still is!). :-) If I could trade-up some of the other Android Tablet's I've had in the past for one of these, I would ... But for £120+ for a 2013 Android Tablet?, nope!. Considering around 2015 you could still buy these new for around the £100 mark?. So for x-years on + a refurbished Model (and NOT a new one instead?), then realistically something around £60+ mark is more tenable? (or preferably less than that even?!), looks more the mark to me ... :-)
Lol, just over 3.5+ year's ago, they were about £99.99/£100 new, in Argos - as I know, as I was considering getting one from them at the time, lol, I didn't buy in the end, as I ended up buying something else after that (but that's neither here nor there). As around mid-2014 to early 2015, that's the general price that they were on Argos across the board - after having dropped from their £150-£200+ price from 6+ months before ...
To be fair to your comment, it really kind of depends on as to what you're pitching for, to be honest?. Eg. Whats App ONLY needs a minimum of Android 2.3+ to install/run/perform?, so ... Whereas other's like Tango, Viber, Skype and the like, you're looking at somewhere more in the region of Android 4.0+ instead?. And even Media App's like, eg. ShowBox, Popcorn Time, Mobdro and the like, you're again looking at Android 4.0+ again?. So, like I mentioned before, it really kind of depends as to what you're really pitching for ... :-)
It's subjective though. Mine (running LineageOS for Android 7 with continued updates) gets used every day, and I think it's the perfect size, especially when travelling, as it's no bigger or heavier than a paperback. I must be in the minority, though, as it's hard to find decent sub-8" tablets these days.