"When I do on-line banking, that's through websites that have extra layers of security. (Matching pictures or clicking on a missing letter in a secret word.) As far as I know, St Pancras hasn't compromised my bank account (if I've done any banking from there).
On 11 January St Pancras's Security Certificate expired and my laptop didn't want to use St Pancras's wi-fi for several days. (I guess it's up to date now.)
I found another totaly free hot spot last week. It's at the Victoria Coach Station. (Some of the buses advertise free wi-fi but I haven't been on one of those yet.) (I'm now using a friend's internet connection in Wales.)"