All suggestions are appreciated :)
I have calmed down a bit now. Some deep breathing and a kitkat or two helped.
I have taken both Xboxes, and all the cables out of their TVs. They cant watch normal TV in their rooms, only DVDs, but cant do that now either. I have got DS2's playbook and the laptop. DS2 also has a desktop computer but he cant use that without the cables.
I can only take away DS1's phone overnight because it's the only way I can contact them whilst I'm at work.
Can't stop pocket money, they don't get it from me.
The school already consider it's my fault that the DSs are not at school so I don't think I will receive any help from that quarter - it's the old 'don't you see them off to school in the morning?' 'oh, you're at work...isn't there anyone else who can do it - partner? grandparents? siblings?....there's NO-ONE??' 
by which time I am feeling stabby.
I rather suspect the only thing that would make a difference is the one thing I can't change - not being on my own. Bollocks, why is it so hard?