I was given an old Tesco Hudl2 recently (Model No. HTFA4B), and the one of the first things I did - perhaps unwisely - was to do a factory reset on it.
Now, after choosing my WiFi connection, it tells me:
Couldn't access internet
An internet connection is needed to setup your hudl. Please check your WiFi settings or connect to a different network.
This page suggests the update server (rather than the "internet") is probably down.
A packet capture seems to suggest it's connecting to https://device.mobile.tesco.com/, but the certificate there expired on 26 June.
A thread at Modaco may have more information, but the forums have been down for at least the last couple of days.