Sounds promising. If they offer it and you can cope with a term of doing 2 schools, I'd go for it, on the understanding it would become full time as soon as you can get out of the other place.

Being full time in one school is far less hassle and if the disciplinary procedures are better, it sounds like you'd have fewer problems with the kind of knuckledraggers you've had this year. It may not be the ideal solution, but it's probably better than the uncertainty of supply work. As you say, you can be sent pretty much anywhere at absolutely no notice whatsoever.

Of course, you know all the pros and cons, but it does sound like it could we worth it at least for a while.