In message , at 17:18:33 on Sat, 25 Feb
2017, tim... remarked:

the auto-top-up that works for me is
5 pounds added when it goes below 5 pounds

Only £20 or £40 is available currently, and the trigger is £10.

yes

that's the point!

How can a £5 auto-topup work for you when it doesn't exist?

there's nothing in my post that says it exists

your saying "works", rather than "would work".
--
Roland Perry