However, today it's proven impossible, unless there's forward pressure on the top left corner (as in pulling it towards the keyboard). So, no pressure, screen looks OK but no way to input, pull it forward, then everything works.
She's finally said "enough is enough" and been to the newly opened Argos (half a mile away, handy!) and bought a new Toshiba! She's now happily sitting setting the new one up, but I can foresee two problems:-
1) Getting the old one going for long enough to transfer all the stuff across. Possibly achievable by sitting it on the table with something applying pressure to the back?
2) Getting all the MS Office apps up and running again. I'm pretty sure I have a disc somewhere with copies of Office 2007 (might take some finding!) but not sure if it's got the codes on it! (NB: It's not hooky, but I seem to think it's not in it's original case and therefore codeless!)