What is classed as annual household income?

I have applied for a government scheme to help with heating costs over winter. One of the criteria is an annual household income of less that £16,000. I earn way less than this. I have a temporary lodger who rents a room for £250 per month. A friend to help split the bills. Even with this extra money my sole income is way below the £16,000 threshold. But, would her income be included in "total annual household income". This would take me over the threshold. She isn't named on any of the bills or mortgage

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