A lot of University halls have Facebook groups where your dc can "meet" the others in their flat, before going.
This not only helps those that are less confident at meeting new people, but, for those sharing a kitchen, they can suggest that one brings X and another brings Y, etc so you don't end up with 8 of everything.
Some universities like you to book a time slot for bringing them (if don't have much parking, which is quite common).
Santandar were recommended as good student bank accounts and you get a railcard with them (check details as these things do change).
Check with the accommodation what is provided - eg, there was an iron and board in ds's flat, but not in dd's. (This is in the Facebook groups if you can find one).
Really good things to take are door stops - all doors are weighted fire doors which are obviously good, from a safety pov, but, while you are in your room, in the first few weeks, it is nice to prop the door open so you can be open to meeting people in your flat. If the door is closed then people don't stop and chat so readily.
Extn cable(s) very useful.
Pack them / persuade them to pack and 'emergency box'....... small screwdriver, pair of scissors, needle and thread, safety pins, paracetamol, plasters. Cold remedy.
Print out some photos to personalise their room (and blu tac to put them up)...... the rooms are very bland otherwise.
Spare toilet roll - something you really don't want to run out of. 