I teach at HCS with the aforementioned José Picardo.
The iPads themselves don't seem to affect socialising. Most pupils use their own phones (full of their photos/videos/apps/music) for that.
The iPads work well for me and for pupils. They are used alongside traditional methods and as a teaching tool but not the sole focus. We have textbooks and exercise books too and certainly in my department, most of the work pupils do still happens there.
In a lesson, pupils can research/gather information as directed or watch a video about a topic or revise on a variety of apps chosen by the teacher. Pupils know they only use iPads when directed in the lesson.
One way they are especially useful is that pupils use them in place of planners/agendas to access a homework management app. Since GHS is part of UL (like HCS and Surbiton), I'd expect that it uses SparkJar too. This handy app has been the absolute end of 'I didn't catch the assignment/forgot to write it in my planner/lost my planner, etc.' Also the app has a chat function so that pupils can ask teachers or each other for help. This solves the 'I didn't understand what to do' problem. Teachers can chat directly to the whole class or specifically to single pupils. In addition to all that, teachers can post copies of worksheets (I couldn't find my sheet = no longer an issue), for direct annotation or not, and photos of or links to other resources (I forgot my book = again not an issue). When pupils submit work through the app, teachers can give feedback/marking at their convenience and even 're-set' the assignment so that pupils need to act on the comments. I often ask pupils to photograph and upload their written work so that I can preview it and make suggestions. Then when I take in the books, I mark the assignment directly on the page so they have a permanent copy.
The app sends e-mails to parents with links so that parents can see what assignments pupils have and if they are keeping up with the work set.
Pupils LOVE their iPads. They carry them everywhere and treat them well. Fingers crossed, no pupil has yet said to me 'it's out of charge' or 'I left it at home' or worse ...