dont do it
keep it for yourself, park it in your garden and know its costing you money to have it sat there ! its better than getting the call to tell you its going to cost £x for something you didnt do ! at least if you break it - you wont feel AS bad !
the schools WILL just want to hand the broken aircraft back to you - because its yours - and thats how they make their money now days -
i looked into this a few years back - when i bought my first aircraft, no matter how you do your sums - you will end up losing out !!!