Thanks Tommy, it’s not really about seeing his usage, and I’m not comfortable having access to anyone’s email.
I was alarmed that he planned to use his Halifax card on his travels, and knowing the crippling fees they charge I looked around for an alternative solution last weekend and found out about Monzo. The geotagging seemed useful to knowing his whereabouts (family concerns) but we’ll work around that.
Once I told him more about Monzo it didn’t take much to convince him to get his own card, which suits me as I’ve grown rather attached to mine!
For that, there are quite a few geotagging apps for friends&family.
Glympse, Life360 Family Locator, Find My Friends (has some emergency broadcast function and I think it’s standard iOS one too), Connect (a bit more social than just bare bits). http://www.familyorbit.com/ seems a bit pricey and I didn’t stumble upon this one before in my research, but it seems to combine ios and android on one platform - not sure what other app does that.