Oh well, only way out was hard reset :(
Packaging up faulty ring to return

PS remote delete was removed from Google Play website in 2013.

Looks like all I can do is a Hard Reset - damn !

(Have ordered some standard NFC tags to test phone and Nexus 7 with too to see if ring is duff as well. Ho-hum).

I've already tried and there does not seem to be any way to remove this app other than actually on the device itself. It does have a lot of security settings and options and seems to (quite rightly) lock itself down very tightly. From Google Play I am stuck as it tells me I need to change the Lock & Erase settings on the device to allow access. Bit of a catch 22.

Any ideas, otherwise I think it's gonna have to be the hard factory reset

Yup, that was what was not good :(
Logged out and logged in with my Google credentials on my laptop to check I was not making an error, but no all was as I thought and I can log in fine normally, outside the ring lock app.
The problem is that I have tried to get the ring to unlock my phone and nothing happens at all now. I tried the Configuration App on a borrowed Nexus 7; it can't even read either side of the ring despite ages spent trying to find the sweet spot. So has my ring failed ?

BUT the bigger problem here is that on my SIII phone I can't get in with the ring and trying to use Google Login I repeatedly get 'Invalid credentials' and I'm permanently locked out !
I've tried restarting, powering off, removing and reinserting the battery, but as soon as the phone powers up the Ring Lock App comes up and there seems to be no way to use my phone !!
Please don't say that a Hardware Factory Reset is the only way out ?!

Any help would be greatly appreciated

Oh dear, this is really not good ! :( aargh.

Hi, I have been using my just arrived ring to try to lock and unlock my SIII with the app.
It worked fine yesterday, but now when I find the 'sweet spot' it just says "Invalid credentials" and won't unlock ?!
I've tried my gmail username and password and get the same error, the obligatory reboot did nothing.
Not happy as now totally locked out of my phone ?! :(
Help