ciao liquidhockey!
sorry for the other night, i got booted out of the chat!
i think only around 30 % of your allowances are subject to taxes, since 70 % should actually represent the duty allowance you perceive overseas, therefore "tax free". This does not mean that your allowance is taxed 30 %!! It means only 30 % has to be declared!
As far as i know, this is T&C with Easyjet.
Take care and good luck!
Mrs. FloatJockey