NOVELTY - A hydrogen production apparatus comprises a combustion reactor positioned within a reforming reactor. The reforming reactor has an inlet connectable to a source of reactant, and an outlet connectable to a fuel cell. The combustion reactor has an inlet connectable to the fuel cell and an outlet connectable to a heat transfer mechanism provided in the reforming reactor.    USE - Producing hydrogen for a fuel cell.    ADVANTAGE - The apparatus has efficient heat integration. It allows reduction in heat losses to atmosphere and permits efficient production of hydrogen.    DETAILED DESCRIPTION - A hydrogen production apparatus comprises a combustion reactor (30) positioned within a reforming reactor (20). The reforming reactor has an inlet connectable to a source of reactant, and an outlet connectable to a fuel cell. The reforming reactor is provided with a heat transfer mechanism. The combustion reactor has an inlet connectable to the fuel cell and an outlet connectable to the heat transfer mechanism, so that the product from the combustion reactor may be passed through the heat transfer mechanism to provide heat to the reforming reactor.    An INDEPENDENT CLAIM is also included for a method of producing hydrogen for the fuel cell employing the above apparatus. The method involves:    (a) reacting fuel comprising a hydrocarbon and/or an oxygenate with steam, under steam reforming conditions in the reforming reactor, to produce a product stream comprising hydrogen;    (b) feeding at least part of the obtained hydrogen to the fuel cell, to produce electric power and a waste stream comprising hydrogen;    (c) reacting at least part of the waste stream with an oxygen-containing gas in the combustion reactor; and    (d) using the heat energy produced in step (c) to supply energy to the steam reforming reaction in step (a).    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of the hydrogen production apparatus.    Pre-heating units (10, 12, 14)    Reforming reactor (20)    Water-shift reactor (22)    Combustion reactor (30)    Pre-reformer (32)