Update.
Close perusal of the 2 8820's I've got show absolutely no differences between the 2 in terms of certificates, software versions etc. Trials with other hotspots show the same - one can send emails over WIFI, one can't. Interestingly, they both seem to change randomly from "UMA" to "uma", and it has no effect on functionality. I think it is most likely that something is set up on one account, but not the other. I'll have to get back on the phone to the "The Damned", as I understand the Orange support team are known in the business!
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