we invested in ISA's, we found out the profit is haraam for us due to it being invested in wine etc. can we use this money for paying household bills? could we donate this money to non-muslims?

In principle, the profits accrued from a Haraam investment is also Haraam (strictly prohibited). The investor should terminate the investment and keep his capital contribution.

The profits accrued from the Haraam investments must be disposed off by giving it in charity to poor and needy Muslims. It is not permissible to use the money for any personal use including the paying of household bills.

and Allah Ta'ala Knows Best

Mufti Ebrahim Desai