Subscription came to an end 18th October cancelled 2 days before have just checked my account settings it says I’m a registered guest 
So you should be able to use the discount.
I was hoping so......I've given it another go this morning and I'm still receiving this notice
“There seems to be a problem with your order. Please try again later or contact Member Services.”

Will leave it a couple of days and will try again if it still doesn't work then I'll get my OH to sign up
and hopefully that should do the trick.
Will report back