No answer first, then second time the lady was extremely, extremely helpful. Some other, online only banks (naming no names), should take note
S 
G
T 
C 
B 
I’ve always directed people to https://monzo.com/help/ (though it now redirects to /faq/) as the numbers are on there in UK and Into formats.
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hot cocoa, wave, insect, stare 
That is why they have the 0800 in the first place.
I know phoneboxes are a dying relic, but 0800 numbers are considerably less stressful when you’re already fizzing with stress and anxiety because you’ve lost track of your valuables.