[stephenc_c_]

In-store Wi-Fi is very common here (UK), and sometimes the only way to get a data connection because mobile signals can't penetrate the building. Only way around it at that point is a to use a VPN over their Wi-Fi if you can.

[nothrabannosir]

Big If :/ it's quite common for vpn to be blocked. Sainsbury's definitely blocks OpenVPN.

[problems]

Use stunnel on port 443 - makes it look just like HTTPS traffic.