I’ve used a tablet to live collect repair data at the Hackney Fixers Restart Party on Saturday, and discovered that it’s not possible to enter a new Brand when adding data (at least on my Android tablet using a recent version of Chrome). You can type it, but if you then move to another field, it doesn’t get saved. My temporary workaround was to enter Brand & Model in the model field instead. It might be worth checking that the same is true for other tablets @neil
I’m seeing the same problem using Firefox - it works in Chrome though.