Thank you for your many sympathetic comments!! My misery has now been replaced with embarrassment at being such a clumsy muppet!!
Having stayed up into the wee small hours I can confirm that all is not so bad. Only 3 models are virtually beyond repair and that's a combination of weakened horse limbs and the fact that the horses were painted so long ago that I no longer remember what shade of brown I used and anyway, GW don't make those shades any more! I do have spare unpainted horses, though ...
9 cavalry models and 6 infantry need new weapons and repairs to minor chipping of paint. A further 16 cavalry and about 12 infantry need repairs to minor paint chipping.
So, it could have been MUCH worse!!