louise henderson alakil , 49 , moved to the international school in the capital sanaa until recent fighting forced it to close .
she is now hiding in a shelter below her family home on the outskirts of the city with her youngest children , miriam , 11 , and ayesha , amid heavy shelling and while bombs fall all around them .
britons have been advised to book commercial flights out the country , but mrs henderson and her children 's passports have expired and the uk authorities in yemen are closed .