Obviously I'm biased, but I'd say get into the TA, and go Signals. You get paid, and you get trained, and if your local unit is anything like mine then you'll get plenty of moral credit and support by virtue of your having supported your family through a rough time.
Don't bother doing schooling, tho. Too many folks competing on those grounds. If you definitely need to get up to date then you're better off getting hired for a specific project. Go on the job and agency websites. Elan recruiting, and LA International spring immediately to mind. Vodaphone, maybe?
Oh, and for what little it's worth, I hope you have tremendous success for after having done your duty by your mum.