How many digital devices can I have connected to my network at any one time
Do you mean TV boxes or devices connect to the internet via your Superhub?
If it's the Superhub then hundreds! Though obviously you could hit bandwidth issues if they're all trying to do stuff at once.
Quick count suggests I've got somewhere between 20 and 30 devices currently connected with a mixture of wired and wireless connections.
I believe the limit for TV boxes is 4 (but I'm not 100% on this, just think I remember reading it on here at some point)
Are you able to confirm if you mean how many TV / digital devices you can have connected to your internet service at one time?
If yes, can you please also confirm which boxes / devices you mean please?