Illustrative example
An unincorporated business folds owing seventy thousand pounds. One partner ran up most of the debts; the creditors are pursuing the other, whose house is the only asset in sight.
Every partner is liable jointly for all debts and obligations of the firm incurred while they are a partner, without any cap and without separation between business and personal assets. The fact that decides exposure is the timing of each debt against the period of partnership - 'while he is a partner' - not who signed for it. How the loss is then shared between the partners themselves is a different question, governed by sections 24 and 44.
The partners agree a written schedule apportioning the debts by reference to who benefited from each, with the partner who incurred the disputed items meeting them first and the balance shared equally.